[WFLY-1634] Make the HTTP Upgrade attribute parsing specific to version 2.0 of the schema.

[darranl]

Also for version 2.0 split out the attribute parsing for http and native interfaces, trying to handle both in the same place was also becomming inconsistant.

[wildfly-ci]

Build 49 is now running using a merge of 91ca3ee

[wildfly-ci]

Build 49 outcome was FAILURE using a merge of 91ca3ee
Summary: Tests failed: 1 (1 new), passed: 4135, ignored: 104

Failed tests

org.jboss.as.test.integration.ejb.timerservice.mgmt.PersistentIntervalTimerManagementTestCase.testSuspendAndTrigger: java.lang.AssertionError: Timer should fire twice! expected:<2> but was:<3>
    at org.junit.Assert.fail(Assert.java:88)
    at org.junit.Assert.failNotEquals(Assert.java:743)

[darranl]

Retest this please

[wildfly-ci]

Build 50 is now running using a merge of 91ca3ee

[wildfly-ci]

Build 50 outcome was SUCCESS using a merge of 91ca3ee
Summary: Tests passed: 4136, ignored: 104

[bstansberry]

Merged.