[r=spiv] report some PostgreSQL stats we need to see
Patches applied:

 * stuart.bishop@canonical.com/launchpad--pgstats--0--base-0
   tag of rocketfuel@canonical.com/launchpad--devel--0--patch-1904

 * stuart.bishop@canonical.com/launchpad--pgstats--0--patch-1
   Generate some basic database statistics

 * stuart.bishop@canonical.com/launchpad--pgstats--0--patch-2
   SIGINT only shutdown running queries

 * stuart.bishop@canonical.com/launchpad--pgstats--0--patch-3
   Updates from review