Fix for memory leaks / cleanup in cel_pgsql

Fix for memory leaks / cleanup in cel_pgsql

There were a number of issues in cel_pgsql's pgsql_log method:
* If either sql or sql2 could not be allocated, the method would return while
the pgsql_lock was still locked
* If the execution of the log statement succeeded, the sql and sql2 structs
were never free'd
* Reconnection successes were logged as ERRORs.  In general, the severity of
several logging statements was reduced

(closes issue ASTERISK-18879)
Reported by: Niolas Bouliane
Tested by: Matt Jordan

Review: https://reviewboard.asterisk.org/r/1624/
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Merged revisions 348888 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 348889 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@348890 65c4cc65-6c06-0410-ace0-fbb531ad65f3