CAS-1286: Extract the OAuth client support in its own module and upgrade to pac4j

Initial commit
CAS-1286: Extract the OAuth client support in its own module and upgrade to pac4j

Merge with master
CAS-1286: Extract the OAuth client support in its own module and upgrade to pac4j

Generate NOTICE for cas-server-support-pac4j
CAS-1293: SimpleTestUsernamePasswordAuthenticationHandler is not visible

SimpleTestUsernamePasswordAuthenticationHandler has been moved to the
'test' tree of cas-core module and therefore not visible to any module
classpath any more. This commit fixes x509 module's WiringTests
by replacing SimpleTestUsernamePasswordAuthenticationHandler with
AcceptUsersAuthenticationHandler.
test scope for cas-server-support-generic module
Merge remote-tracking branch 'upstream/master' into CAS-1286
Merge pull request #227 from Unicon/CAS-1293

CAS-1293: SimpleTestUsernamePasswordAuthenticationHandler is not visible
Merge remote-tracking branch 'upstream/master' into CAS-1286
CAS-1286: Extract the OAuth client support in its own module and upgrade to pac4j

After Misagh's code review
CAS-1286: Extract the OAuth client support in its own module and upgrade to pac4j

Handle properly required additionnal HTTP action from pac4j
Merge pull request #223 from leleuj/CAS-1286

CAS-1286: Extract the OAuth client support in its own module and upgrade to pac4j
Merge branch 'master' into CAS-1245

Conflicts:
	cas-server-uber-webapp/NOTICE