idmapper nfs4_gss_princ_to_ids fix:
idmapname2id() is called in case of name to id mapping.
This calls the nfs4_name_to_uid() API.

On success from nfs4_name_to_uid(), we again try to get id,
this time treating the username as kerberos principal.
This calls nfs4_gss_princ_to_ids() which is incorrect.

Removed the call nfs4_gss_princ_to_ids() from idmapname2id().

Reported-by: John Dorfner <dorfner@us.ibm.com>
Signed-off-by: suhrud <supatank@in.ibm.com>