unset static field after test suite has been completed.
Allow passing additional parameters to the test JVM like GC settings etc.
allow passing JVM args via env variables if not defined via the cmd
removed the static field in ChildrenConstantScoreQueryTests
Added random test for ParentConstantScoreQuery
property file for client build projects

this property file contains url information for s3 elasticsearch server
bits retrieval on master, 0.90 branch
add nightly es_node_mode radomization
jenkin scripts modification

1) client_tests_url, switch to JDK6
2) build_ranodmization, add jvm options randomization
AckTests: more assertAcked and added common method to retrieve local cluster state