HTTP/2 stress test timeout

Motivation:
The stress tests have been observed to fail on the CI server. The average run time of the stress tests has recently been 26+ seconds.  Our timeout is currently set to 30 seconds.

Modifications:
Increase the timeout for the stress test so when the leak profile is active we will have more time to complete the test (with the additional overhead).

Result:
Stress tests fail less frequently (hopefully not at all).
HTTP/2 unit test failure race condition

Motivation:
HttpToHttp2ConnectionHandler is awaiting on a future and a latch that may be competed before the buffers actually get released.  This test is attempting to validate that the buffer's refCnt() is 0 but there is no mechanism to wait on for a buffer's release() method to be called.

Modifications:
Remove the buffer refCnt() check.  The leak profile is designed to pick these up.

Result:
Unit tests that no longer have a race condition.
Suppress channelReadComplete until MessageAggregator completes aggregating a message. https://github.com/netty/netty/issues/3168

Motivation:
This fixes issue 3168 where HttpObjectAggregator does not suppress
channelReadComplete() when aggregation is not yet finished.

Modifications:
Ignore channelReadComplete until a message completes aggregation.
MessageAggregator currently tracks the currentMessage being aggregated.
This variable transitions to non-null when aggregation begins and back
to null when aggregation completes or fails. When the currentMessage is
null, it is safe to issue a channelReadComplete because the
corresponding channelRead will have completed aggregation.

Result:
channelReadComplete will only fire one time on each completed message
aggregation.
Revert "Suppress channelReadComplete until MessageAggregator completes aggregating a message. https://github.com/netty/netty/issues/3168"

This reverts commit cb95a1331d2dfed63d9f8732657beb6c2a6778fd.
Compress the heap dump generated by TestUtils.dump()

Motivation:

It takes too long to download the heap dump from the CI server.

Modifications:

Compress the heap dump as much as possible.

Result:

When heap dump is generated by certain test failure, the generated heap
dump file is about 3 times smaller than before, although the compression
time will increase the build time when the test fails.
Fix build errors due to missing dependency
Generate non-test JAR for netty-testsuite

Motivation:

So far, we generated and deployed test JARs to Maven repositories. The
deployed JAR had the classifier 'test-jar'.  The test JAR is consumed by
transport-native-epoll as a test dependency.

The problem is, when netty-transport-native-epoll pulls the test JAR as
a dependency, that Maven resolves its transitive dependencies at
'compile' and 'runtime' scope only, which is incorrect.

I was bitten by this problem recently while trying to add a new
dependency to netty-testsuite.  Because I added a new dependency at the
'test' scope, the new dependency was not pulled transitively by
transport-native-epoll and caused an unexpected build failure.

- d6160208c37cfd21b690f1a0df67776bf986b28e
- bf77bb4c3ae04778e65b8a38c2a9ec0e15207de8

Modifications:

- Move all classes in netty-testsuite from src/test to src/main
- Update the 'compile' scope dependencies of netty-testsuite
- Override the test directory configuration properties of the surefire
  plugin
- Do not generate the test JAR anymore
- Update the dependency of netty-transport-native-epoll

Result:

It is less error-prone to add a new dependency to netty-testsuite.
ensure getRawQuery is not null before appending

Motivation:

without this check then given a URI with path /path the resulting URL will be /path?null=

Modifications:

check that getRawQuery doesn't return null and only append if not

Result:

urls of the form /path will not have a null?= appended
Motivation: Sonar points out an equals comparison, where the types compared are different and don't share any common parent http://clinker.netty.io/sonar/drilldown/issues/io.netty:netty-parent:master?severity=CRITICAL#

Modifications:
Converted AsciiString into a String by calling toString() method before comparing with equals(). Also added a unit-test to show that it works.

Result:
Major violation is gone. Code is correct.
Compress the heap dump after tests are finished

Motivation:

Tests sometimes time out because it took too long to compress the
generated heap dump.

Modifications:

- Move the compression logic to a new method 'compressHeapDumps()'
- Call TestUtils.compressHeapDumps() at the end of the tests, so that
  the tests do not fail because of timeout

Result:

JUnit reports the real cause of the test failure instead of timeout
exception.
Log detailed information about renegotiation and traffic

Motivation:

We need more information to understand why SocketSslEchoTest fails
sporadically in the CI machine.

Modifications:

- Refactor SocketSslEchoTest so that it is easier to retrieve the
  information about renegotiation and the current progress

Result:

We will get more information when the test fails.
Fix checkstyle
Java ALPN provider version update

Motivation:

There was a bug in the Java ALPN library we are using.  A new version was released to fix this bug and we should update our pom.xml to use the new version.

Modifications:

Update pom.xml to use new ALPN library.

Result:

Newer versions of JDK (1.7_u71, 1.7_u72, 1.8_u25) have the bug fixed.
Do not use SLF4J/Logback API directly

Motivation:

TrafficShapingHandlerTest uses Logback API directly, which is
discouraged.  Also, it overrides the global default log level, which
silences the DEBUG messages from other tests.

Modifications:

Remove the direct use of Logback API

Result:

The tests executed after TrafficShapingHandlerTest logs their DEBUG
messages correctly.