aaa: Fix the name of property for list of ldap servers

Fixes the name property for list of ldap servers to be the same as
in ConfigValue -> "LdapServers" (of course in aaa part with prefix
"config."

Topic: AAA
Change-Id: I796385144fb163d2ddf0298bcb653cf88bc77772
Bug-Url: https://bugzilla.redhat.com/1111071
Signed-off-by: Martin Perina <mperina@redhat.com>