ARGUS-5: added periodic flush to local and HDFS files; and configurable
parameters for the same in xasecure-audit.xml and install.properties
ARGUS-5: dev-test update for HDFS audit provider.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-argus
ARGUS-5: audit test code/config updated to enable testing with HDFS
audit store.
ARGUS-5: fix per review comments