[AS7-4083] Added channel metrics.
[AS7-4083] Added protocol metrics.
[AS7-4083] Added protocol metric descriptions and channel attributes.
Adjust names for correct use of ResourceDefinition and Resource. Also changes for i18n.
[AS7-4083] Adjust management API version to 2.0.0.
[AS7-4083] Fix i18n and copyright text issues.
[AS7-4083] Fix issue with navigation to a non-existent channel.
[AS7-4083] Fix null-channel issue.
Undertow subsystem - new configuration format
Move undertow subsystem package under new name
Move IO subsystem package under new name
Fix xsd test to include wildfly schemas
Initial implementation of filters
Fix/add copyright headers
Change the error pages from http://localhost:9990/error/**** to As 8 and wilfdFly logo
change layout a bit & sync style with welcome content

- optimize images for web
[AS7-6836] JMS access over HTTP

* bump messaging subsystem XML schema to urn:jboss:domain:messaging:1.4
* bump messaging management version to 1.3.0
* add servlet-connector resource to hornetq-server to define a connector
  that will connect to the HornetQ server over HTTP by tunneling through
  a Servlet
* add to the messaging subsystem XML config a servlet-connector and a
  JMS ConnectionFactory that uses it.
* add an optional dependency to the org.jboss.as.web-common module to be able
  to deploy the servlet from the org.jboss.as.messaging module
* add test JMSClientTestCase#testJMSOverHTTPWithServlet()
add debug for netty/undertow/hornetq
add test with infinite loop
Ignore the infinite loop test to avoid blocking the CI