Add ability to overwrite mgmt-users.properties when building the server config in the test suite

At the moment Arquillian overwrites mgmt-users.properties.

This is a feature we need for our testsuite, but it is not something that the average end user of Arquillian would expect. Instead when we build our server config in the testsuite a mgmt-users.properties file should be created/copied in.

The only affected test appears to be:

1. modified: testsuite/integration/basic/src/test/java/org/jboss/as/test/integration/management/http/HttpGetMgmtOpsTestCase.java
2. modified: testsuite/integration/basic/src/test/java/org/jboss/as/test/integration/management/http/HttpPostMgmtOpsTestCase.java
3. modified: testsuite/integration/basic/src/test/java/org/jboss/as/test/integration/ws/tools/jbws3207/JBWS3207TestCase.java
4. modified: testsuite/integration/smoke/src/test/java/org/jboss/as/test/smoke/jsr88/EnterpriseDeploymentTestCase.java
5. modified: testsuite/integration/smoke/src/test/java/org/jboss/as/test/smoke/surefire/servermodule/HttpDeploymentUploadUnitTestCase.java

I am going to @Ignore these for now, and they should be un-ignored once we have a mgmt-users.properties file.