[WFLY-2131] Filter the operations shown by read-operation-names

This simply strips out the operations which are not valid for the current user.
I have not done, and don't know if the following are necessary:
1) Make the stripping out configurable, e.g. by adding a parameter to the operation
2) Include the stripped out operation names in an operation header (vaguely similar to what read-resource does for non readable resources)