ACCUMULO-1062 disabling testParallelWriteSpeed

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1461552 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1215 Backport change to stop running test from 1.5 to 1.4
Merge remote-tracking branch 'origin/1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT