Fix a small problem where the "svnversion" command may output an error message and therefore creates invalid manifest (with special chars included). This checks with regex, if the returned SVN revision is according to spec, otherwise it writes "unknown" to manifest
Fix a small problem where the "svnversion" command may output an error message and therefore creates invalid manifest (with special chars included). This checks with regex, if the returned SVN revision is according to spec, otherwise it writes "unknown" to manifest

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@1684825 13f79535-47bb-0310-9956-ffa450edef68

apache/solr,apache/solr,apache/solr,apache/solr,apache/solr