Ticket #47748 - Simultaneous adding a user and binding as the user could fail in the password policy check

Bug description: In do_bind, bind_target_entry is retrieved from the
DB or the entry cache.  There was a small window that the entry failed
to retrieve from there but the bind procedure in the backend (be_bind)
succeeds.  In the case, NULL bind_target_entry is passed to the Pass-
word Policy check and it fails.

Fix description: If be_bind returns SUCCESS and bind_target_entry is
NULL, retrieve bind_target_entry agian, which is guaranteed since the
entry was retrieved in the backend and placed in the entry cache.

https://fedorahosted.org/389/ticket/47748

Reviewed by rmeggins@redhat.com (Thank you, Rich!!)
(cherry picked from commit 4fc53e1a63222d0ff67c30a59f2cff4b535f90a8)
Ticket 47740 - Fix coverity issues(part 7)

12496 - resource leak - ldap/servers/slapd/mapping_tree.c
12497 - resource leak - ldap/servers/slapd/mapping_tree.c
12500 - resource leak - ldap/servers/plugins/chainingdb/cb_instance.c
12501 - resource leak - ldap/servers/plugins/sync/sync_refresh.c
12506 - resource leak - ldap/servers/plugins/chainingdb/cb_config.c
12509 - reosurce leak - ldap/servers/plugins/chainingdb/cb_bind.c
12510 - reosurce leak - lib/ldaputil/certmap.c
12538 - resource leak - ldap/servers/plugins/mep/mep.c
12539 - resource leak - ldap/servers/plugins/posix-winsync/posix-winsync.c
12540 - resource leak - ldap/servers/plugins/posix-winsync/posix-winsync.c
12541 - resource leak - ldap/servers/plugins/posix-winsync/posix-winsync.c
12542 - resource leak - ldap/servers/plugins/posix-winsync/posix-winsync.c

https://fedorahosted.org/389/ticket/47740

Reviewed by: nhosoi(Thanks!)
Ticket 47759 - Crash in replication when server is under write load

Bug Description:  When the server is under alot of load, a race condition allows
                  a replication connection LDAP struct to be freed(unbind) while
                  it is being used by another thread.  This leads to a crash.

Fix Description:  Extend the connection lock to also cover ldap client interaction
                  (e.g. conn->ld struct).

https://fedorahosted.org/389/ticket/47759

Reviewed by: nhosoi & rmeggins(Thanks!!)
(cherry picked from commit 9940ca29ca258891c52640a23adc2851afe59d0e)