ldap: Removing the openldap server related packages

nss-pam-ldapd uses the openldap API to interact with the
ldap server.

openldap recipe includes the openldap daemon as a LDAP server
and the libraries implementing the LDAP protocol.

BMC would be acting as LDAP client so we don't need those
pacakages which is related to LDAP server.

Packages which is being removed through this commit are
mdb,passwd,dnssrv,monitor,meta etc,these are slapd backends.

Tested: This commit reduces the size of the image by 1.5M.

(From meta-phosphor rev: dd63751bbbaad25b745aa210b587d6818c083ece)

Change-Id: Id8a64c3775b3c771258072e866cfd0c070af57db
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>