[ELY-98][ELY-50] Realms delimiter escaping in Digest-MD5 + tests and fixes

* [ELY-50] Added support of escaped delimiter of realms in Digest-MD5 props (discussed with Peter)
* [ELY-98] Not working byteman Digest-MD5 tests rewriten to JMockit tests

Note: Test of Unicode chars in credentials, which was in not working byteman tests now fails on Windows. I set it as ignored, it is better that ignore whole test.
(I try prepare fix in future.)