added full ldap/kerberos support to authnz module, add mam as exemple

repo/common/authnz/nsswitch.conf

@@ -0,0 +1,27 @@
+# /etc/nsswitch.conf
+#
+# Example configuration of GNU Name Service Switch functionality.
+# If you have the `glibc-doc-reference' and `info' packages installed, try:
+# `info libc "Name Service Switch"' for information about this file.
+
+passwd:         compat
+passwd_compat:	ldap
+
+shadow:         compat
+shadow_compat:	ldap
+
+group:          files ldap
+
+gshadow:        files
+
+hosts:          dns files
+networks:       files
+
+protocols:      db files
+services:       db files
+ethers:         db files
+rpc:            db files
+
+netgroup:       ldap
+
+aliases:	files ldap