Make the use_*_tls options half respect old values. If you leave it as

Make the use_*_tls options half respect old values.  If you leave it as
true, then it would try to use STARTTLS.  While I understand this is a
new feature, and this is the dev branch, a little backwards compatibility
is easy in this case.  The value 2 is considered true... Using === instead
is an exact match, so you'd have to have 2 in the use_*_tls options for it
to trigger starttls mode.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@10832 7612ce4b-ef26-0410-bec9-ea0150e637f0