tests: raise poll timeout

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1569798 13f79535-47bb-0310-9956-ffa450edef68
tests: raise poll timeout

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1569800 13f79535-47bb-0310-9956-ffa450edef68