Include SubjectKeyIdentifier in generated X.509 certificates - EUCA-7101

EUCA-7101
Load properties from database less frequently - EUCA-7040

Database properties are now reloaded at most every ten seconds.

EUCA-7040
Merge remote-tracking branch 'origin/dev/sjones/EUCA-7101' into testing
Merge remote-tracking branch 'origin/dev/sjones/EUCA-7040' into testing
LDAP identity synchronization now only runs on coordinator - EUCA-7102

LDAP identity synchronization was incorrectly running on any Java host,
this operation is now only performed on the coordinator.

EUCA-7102
Merge remote-tracking branch 'origin/dev/sjones/EUCA-7102' into testing