Another pg_autovacuum patch

Ok, one more pg_autovacuum patch (Thanks to Tom for fixing the long long
overflow problem).

This patch addresses two minor issues (the last two pg_autovacuum bugs I
know of):

First the CountAtLastAnalyze varable was initially being set incorrectly
causing pg_autovacuum to perform unneeded analyzes on during startup.

Second, there was a debug print statement left in that was printing
relisshared.

The attached patch fixes both issues, and should be applied to both 7.4
and HEAD.

Thanks,

Matthew O'Connor