nfs: fall back to numeric mapping by default

Linux client uses number based mapping by default.
This makes dCache default configuration to have
'bad' behaviour. Let make our default same as linux
has.

Acked-by: Paul Millar
Target: master, 2.6
Require-book: no
Require-notes: yes
(cherry picked from commit 2d6a1aa)

skel/share/defaults/nfs.properties

@@ -52,8 +52,8 @@ nfs.idmap.cache.timeout.unit = SECONDS
 
 
 # Allow legacy numeric strings instead of principals. Used for backward compatibility
-# and for setups without mapping service lile NIS or LDAP.
-(one-of?true|false)nfs.idmap.legacy = false
+# and for setups without mapping service like NIS or LDAP.
+(one-of?true|false)nfs.idmap.legacy = true
 
 #
 # enable RPCSEC_GSS