Revert "More UNDERTOW-151 ignores"

This reverts commit a7714daa1265bbdcc886271a7ecb6d120475145c.
Revert "@Ignore all Spnego tests for now, as they intermittently fail with -Pproxy"

This reverts commit c94a0c03f03719c6c09f517c5b7a6cca447113d1.
[UNDERTOW-161] An extension to the LoadBalancingProxyClient that allows for connections to be exclusively associated with the calling clients connection.
[UNDERTOW-151] No longer needs to be ignored for AJP testing.