Make not assume that the cel_sqlite3_custom SQL table primary key is AcctId.

Make not assume that the cel_sqlite3_custom SQL table primary key is AcctId.

If a table is created by some other application and the primary key is not
named "AcctId", cel/cel_sqlite3_custom.c will always try to create the
table and fail because it already exists.

* Change the SQL table query to not require AcctId as the primary key.

(closes issue ASTERISK-18963)
Reported by: socketpair
Patches:
      fix.patch (license #6337) patch uploaded by socketpair
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Merged revisions 349819 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 349820 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@349821 65c4cc65-6c06-0410-ace0-fbb531ad65f3