[wildfly-dev] Minor API change

[David M. Lloyd]

This Elytron pull request [1] introduces a minor API change for users of 
modifiable security realms who iterate the identities within the realm.

This change affects one test in wildfly-core.  I have a commit [2] 
which, if [1] is accepted, I will relay into a pull request for 
wildfly-core which allows the test to compile and run with both the old 
and new code.

If anyone sees a problem with changing this API, please let me know ASAP.

[1] https://github.com/wildfly-security/wildfly-elytron/pull/872
[2] https://github.com/dmlloyd/wildfly-core/commit/835930eddca8d

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- DML