Be more verbose when logging errors in info LDAP plugin

Be more verbose when logging errors in info LDAP plugin

The infoldap plugin was logging raw exceptions but not providing
any context to them.

This breaks some of the calls into separate try/except to provide
more precise failure reasons.

Also fix a typo in the authldap plugin and handle ValueError
when validating the template syntax.

https://fedorahosted.org/ipsilon/ticket/39

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>
Reviewed-by: John Dennis <jdennis@redhat.com>