tests: fix hdfs collections api test

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_5@1531773 13f79535-47bb-0310-9956-ffa450edef68
tests: poll a bit longer

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_5@1531776 13f79535-47bb-0310-9956-ffa450edef68