Ticket 47451 - Remove old code from linked attr plugin

Description:  Some old/unneeded functions/declarations were accidentally left
              behind in the linked attributes plugin.

https://fedorahosted.org/389/ticket/47451

Reviewed by: nhosoi(Thanks!)
Ticket 47670 - Aci warnings in error log

Bug Description:  Some aci warnings are unneccesarily written to the
                  error log.

Fix Description:  Lower the log messaages from SLAPI_LOG_FATAL to SLAPI_LOG_ACL

Patch provided by: chatfield(Thanks!)

https://fedorahosted.org/389/ticket/47670

Reviewed by: nhosoi(Thanks!)
Ticket #47720 - Normalization from old DN format to New DN format doesnt handel condition properly when there is space in a suffix after the seperator operator.

Description: DN normalizer (slapi_dn_normalize_ext) follows RFC 4514
and keeps a white space if the RDN attribute type is not based on the
DN syntax.  But Directory server's configuration entry sometimes uses
"cn" to store a DN value (e.g., dn: cn="dc=A,dc=com",cn=mapping tree,
cn=config), which expects the value of cn treated as DN although cn
is not a DN syntax type.  To solve the problem, this patch introduces
a configuration parameter "nsslapd-cn-uses-dn-syntax-in-dns" to "cn=
config" which takes "on" or "off".  If "on" is set, if the value of
cn under "cn=config" is quoted, it's processed as DN.  By default,
  nsslapd-cn-uses-dn-syntax-in-dns: off

https://fedorahosted.org/389/ticket/47720

Reviewed by mreynolds@redhat.com (Thank you, Mark!!)
Ticket 47636 - errorlog-level 16384 is listed as 0 in cn=config

Bug Description:  Even if the nsslapd-errorlog-level is set to the
                  default value(16384), a search on cn=config returns
                  the value "0".  This is inconsistent and confusing
                  with the server documentation.

Fix Description:  Do not convert the default errorlog level to zero when
                  updating the internal configuration.  We still allow
                  zero to be set from a ldap client to return the logging
                  to the default state, but that zero will still be stored
                  as 16384.

https://fedorahosted.org/389/ticket/47636

Reviewed by: rmeggins & nhosoi(Thanks!!)