Reduce the perceived time taken to retrieve initialSeedUniquifier

Motivation:

When system is in short of entrophy, the initialization of
ThreadLocalRandom can take at most 3 seconds.  The initialization occurs
when ThreadLocalRandom.current() is invoked first time, which might be
much later than the moment when the application has started.  If we
start the initialization of ThreadLocalRandom as early as possible, we
can reduce the perceived time taken for the retrieval.

Modification:

Begin the initialization of ThreadLocalRandom in InternalLoggerFactory,
potentially one of the firstly initialized class in a Netty application.

Make DefaultChannelId retrieve the current process ID before retrieving
the current machine ID, because retrieval of a machine ID is more likely
to use ThreadLocalRandom.current().

Use a dummy channel ID for EmbeddedChannel, which prevents many unit
tests from creating a ThreadLocalRandom instance.

Result:

We gain extra 100ms at minimum for initialSeedUniquifier generation.  If
an application has its own initialization that takes long enough time
and generates good amount of entrophy, it is very likely that we will
gain a lot more.
Fix another buffer leaks in JsonObjectDecoderTest
Add missing m2eclipse life cycle mapping

Also, use ignore instead of execution because those plugins are not
really useful when building from Eclipse anyway.
Move generic code to HttpOrSpdyChooser to simplify implementations

Motivation:

HttpOrSpdyChooser can be simplified so the user not need to implement getProtocol(...) method.

Modification:

Add implementation for the method. The user can override it if necessary.

Result:

Easier usage of HttpOrSpdyChooser.