Add reference from an alias Host to its real Host.
Add list of aliases to the real Host.
Amend the test case.

This backports r1606651 r1606680 minus a pair of isAlias() checks that will be committed separately.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1608831 13f79535-47bb-0310-9956-ffa450edef68
Add missing colon.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1608832 13f79535-47bb-0310-9956-ffa450edef68
Improve the fix for https://issues.apache.org/bugzilla/show_bug.cgi?id=44312
Check that addContextVersion/removeContextVersion, addWrapper/removeWrapper, add/clear/removeWelcomeFile[s] are performed on the real Host, as expected by the caller.

This backports the checks from r1606680 and r1608824.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1608833 13f79535-47bb-0310-9956-ffa450edef68