Ticket #47378 - fix recent compiler warnings
    
    https://fedorahosted.org/389/ticket/47378
    Reviewed by: nhosoi (Thanks!)
    Branch: master
    Fix Description: Fix the various compiler warnings as reported by
    http://jenkins.cloud.fedoraproject.org/job/389-ds-base/ws/build-warns.1370449480.txt
    In addition, fixed a bug in the slapi_re_subs_ext - if there was an
    ampersand that did not need to be replaced, that is, if the ampersand
    was part of an LDAP search filter, it was replaced with a '('.  Also, an
    ampersand preceeded by an open parenthesis and followed by a non-open
    parenthesis is supposed to be replaced in the string, but this was not
    working.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no