ACCUMULO-1878 handle error conditions in example tests.

* ensure simple examples used in integration tests properly set non-zero exit on errors
* check return code of executed commands.
* fix typo in bloom filter speed comparison
* fix error in arg order on helloworld examples
* Makes sure paired examples for RandomBatch use the same seed.

Signed-off-by: Keith Turner <kturner@apache.org>
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	examples/simple/src/main/java/org/apache/accumulo/examples/simple/client/RandomBatchScanner.java
	test/system/auto/simple/examples.py

In addition to merging from 1.4 also fixed a lot of issues with examples functional test that were not issues in 1.4.
ACCUMULO-1878 fix example integration tests