Fix Astyanax config regression

c209160ecacc5498475d98b717c29f1ba7ac1439 forced Astyanax's
NodeDiscoveryType and ConnectionPoolType settings to their respective
Astyanax-level defaults (not the defaults at the top of
AstyanaxStorageManager.java).  At issue was a builder method called
twice without coordination between the two calls.

This commit also removes the superfluous "storage" prefix on config
keys used in InternalAstyanaxKCVTest.
Reverse commons-config automatic list parsing

Rexster calls TitanGraphConfiguration#convertConfiguration with what
Apache Commons Config calls a "hierarchical" configuration.  This
subset of Commons Config automatically turns comma-separated string
values into lists.  TitanGraphConfiguration needs to join these lists
back together as Strings for e.g. passing a list of seeds to a
Cassandra backend.  RexsterTitanServer does not use hierarchical
configurations and is not exposed to this automatic list parsing.
Adding release signing profile to parent pom