Previously, an error while processing any single table would cause
pg_reorg to cause exit() and bail out. Quick summary of fixes:
* get rid of pgut_atexit_push() and pgut_atexit_pop() use, since
we are no longer relying on calling exit() to handle mundane errors
* remove lock_conn_pid variable; we can just use buffer instead
* lock_exclusive() and lock_access_share() now return bool instead of
bailing out on any error
* ERROR-level ereport() or elog() calls now return WARNING instead,
to avoid bailing out unnecessarily
* signature of reorg_cleanup() changed; it no longer needs to take a
void pointer
* check return of strdup() for vxid
* Use pgut_rollback() instead of sending ROLLBACK; command directly
There are still one or two FIXMEs left, including fixing table name
escaping, but I'm committing this much.
00ddb1edf9