ACCUMULO-2239 reformat test README files to Markdown

Signed-off-by: Bill Havanki <bhavanki@cloudera.com>
ACCUMULO-2522 wait for accumulo to be up before testing the proxy
Merge branch '1.4.5-SNAPSHOT' into 1.5.2-SNAPSHOT

Conflicts:
	test/system/auto/README.md
	test/system/bench/README
	test/system/continuous/README
	test/system/scalability/README.md
	test/system/test1/README
	test/system/test2/README
	test/system/test4/README
Merge branch '1.5.2-SNAPSHOT' of https://git-wip-us.apache.org/repos/asf/accumulo into 1.5.2-SNAPSHOT
ACCUMULO-2526
ACCUMULO-2522 fix timeout typo