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Constraints that name method omissions are dealt with differently.
We create an entry in the mappings with key "<method>.omission". This entry
is only ever combined with other omissions for the same method to produce a
consolidated RoleInfo. Then, when we wish to find the relevant constraints for
a given Request (in prepareConstraintInfo()), we consult 3 types of entries in
the mappings: an entry that names the method of the Request specifically, an
entry that names constraints that apply to all methods, entries of the form
<method>.omission, where the method of the Request is not named in the omission.