[WFLY-2840] take scheduled timezone into account when calculating next timeout
Merge pull request #5866 from bmaxwell/WFLY-2840

[WFLY-2840] take scheduled timezone into account when calculating next t...
[WFLY-1523] Introduce caching for LDAP access by security realms for user searching, caching validated passwords and caching the results of group searches.
[WFLY-1523] Some minor modifications following code review of the LDAP cache implementation.