Remove obsolete openam-test integration test suite

Delete the openam-test module entirely. It was an in-process TestNG
suite whose TestBase static initializer bootstrapped a full OpenAM
instance (Bootstrap.load) and called System.exit(1) when no configured
instance with a reachable configuration store was available, so the
tests could never run as part of a normal build.

The module was never registered in the Maven reactor and had been
unmaintained since the 10.2.0 era. Several tests referenced APIs that
no longer exist: the removed ssoadm policy/realm commands
(ListPolicyNames, RealmGetPolicy, RealmDeletePolicy) and the static
ApplicationManager, replaced by the Guice-based ApplicationServiceFactory.

Author: vharseko