Remove jre7 profiles from poms

JRE7-compatible behavior is now the pom default.  Keeping these
profiles no longer makes sense now that I've added a stylesheet to
rewrite them for JRE6 builds, and Maven profile activation is error
prone anyway (e.g. activating one or more profiles on the command line
deactivates all profiles that have
<activeByDefault>true</activeByDefault>).
Remove stale reference to jre7.xslt

I removed this stylesheet a few commits ago, but a reference to it
lived on in pom.xml.  Deleted.
Removed ES from titan-dist-cassandra

Moved Cassandra + ES tests into titan-dist-all and made
titan-dist-server include those new tests.  Also added a BDB + ES test
in titan-dist-all.
Reduced loglevel of needlessly severe test log msg

There was no reason for these two messages to be logged at ERROR.
They belong at DEBUG or at most INFO.
pom.xml: move Saxon version declaration

It seems that plugin configurations don't care about
dependencyManagement versions.  I would probably have to use
pluginManagement here, but that just makes it less readable since the
plugin is only used one time.
pom whitespace change
Avoid overlapping template matches in jre6.xslt

When multiple template patterns in a stylesheet match, Saxon throws a
warning and continues parsing.  In this case the multiple match is
harmless, but the warning is scary so I'm making a minor change to
avoid the match overlap.
Tweaking JRE6 pom stylesheet