res_sorcery_astdb.c: Fix get multiple records by regex.

res_sorcery_astdb.c: Fix get multiple records by regex.

* Fix sorcery_astdb_retrieve_regex() pattern matching.  Let the regexec()
function match the stored key values instead of having astdb prefilter
them.  Previoiusly you could only use a simple regex pattern when the
pattern began with '^'.

* Fix off nominal memory leak in sorcery_astdb_retrieve_regex().
........

Merged revisions 403545 from http://svn.asterisk.org/svn/asterisk/branches/12

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@403546 65c4cc65-6c06-0410-ace0-fbb531ad65f3