Allow admin to override rmake chroot user (RMK-1097)
Possible fix for stray mounts when using namespaces
rootserver: use socket path instead of PID to make unique logs/locks

With namespaces, the rootserver always has a PID of 1. This resulted in
locking or permission errors when entering an existing session. The
socket path is already unique so use that instead.
rootmanager: gracefully skip over corrupt conary databases
chrootcache: fix locking around hardlink cache

Previously a chroot that was still being stored might get copied and
result in incomplete contents.
Add 'lzop' chrootcache type; add partial restores to archive chrootcaches
Fix "rmake watch" never exiting if server dies (RMK-1098)
Test fixes
Add optional cache size limit to chrootcache setting
Test fixes
Add an option memcache implementation of authcache
Remove debugging print statements
Fix psycopg2 driver compatibility
Add a delay between log polls when using non-interactive monitor

Previously it would poll after only a 0.1s sleep.
Centralize the SIGUSR1 breakpoint handler

Also fallback to Conary's embedded epdb if epdb is not installed.
Added a 'reload' command to rmake-server
Fix dispatcher writing to the main server log
Terminate the build log recorder if the parent builder disappears