Upgrading to CXF 2.7.6

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1505954 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-408] Applying provided patch, successfully tested against all supported databases

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1510390 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-408] Merge from 1_1_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1510392 13f79535-47bb-0310-9956-ffa450edef68