Ticket #47409 - allow setting db deadlock rejection policy

https://fedorahosted.org/389/ticket/47409
Reviewed by: nhosoi (Thanks!)
Branch: 389-ds-base-1.3.0
Fix Description: Fix coverity CID 11893 (#1 of 1): Unsigned compared against 0 (NO_EFFECT)
val is u_int32_t which is never less than 0
Platforms tested: RHEL6 x86_64
Flag Day: no
Doc impact: yes - document new config parameter
(cherry picked from commit 989a30bb2d63ee6b9157a9eb6a3d2ff6828abc60)
(cherry picked from commit 75b9e42a6555073d902526c20a606d17fd11f967)
Ticket #47419 - Unhashed userpassword can accidentally get removed from mods

Bug description:
Change made in commit 4305deeaa41ea8703ebb9ea6529790dd609b3060
sets LDAP_MOD_IGNORE to unhashed password in mods once it's
stashed in an entry extenstion.  It could be freed any time
once pack_mods is called.

Fix description: This patch stops setting LDAP_MOD_IGNORE to
unhashed password in mods.

https://fedorahosted.org/389/ticket/47419

Reviewed by Nathan (Thank you!!)

(cherry picked from commit cce8d346c308f0852aaf6e74775180cb7d8ccfaa)