Add support for percona55-cluster.
Merge branch 'joyent/feature/pbulkmulti/2013Q2' into joyent/release/2013Q2
Update 'joyent' and 'wip' submodules.
Revert previous, breaks USERGROUP_PHASE=configure.

Even though pbulk does a 'make clean' for that case, the problem is that
we already created /home/pbulk/build as root.  If we still hit
permission errors, we should diagnose and fix them.
Merge branch 'joyent/feature/miscfix/2013Q2' into joyent/release/2013Q2
Fix 'pkg_add -f'.
Merge branch 'joyent/feature/miscfix/2013Q2' into joyent/release/2013Q2
Backport pkgin 'pkg_add -f' fix from trunk.
Merge branch 'joyent/feature/miscfix/2013Q2' into joyent/release/2013Q2
Update 'joyent' submodule.
Merge branch 'joyent/release/2013Q2' into joyent/release/2013Q2_multiarch