Replace java dependencies in PE with pe-java

PE now has the openjdk built to use with pe-puppetdb, so this commit updates
pe-puppetdb to use pe-java at the expected location. It sets @java_bin, which
overrides the default in puppetdb_defaults, and adds pe-java as a dependency in
both the debian/control and redhat/puppetdb.spec files.
Replace erb conditional with rpm macro conditional.
Merge pull request #402 from haus/pe_java_fixups

Pe java fixups