Code review request: 8009970: Several LoginModule classes need extra permission to load AuthResources

[Weijun Wang]

http://cr.openjdk.java.net/~weijun/8009970/webrev.00

I was checking for krb5 permissions and noticed this. There is really no 
need for a permission to access AuthResources strings in these login 
modules.

Also change to private, building JDK shows no other class uses the fields.

Noreg-trivial.

Thanks
Max