External DNS requests for public name now return public IP - EUCA-7275

EUCA-7275
added missing EnabledMetric object
EUCA-7270
Needed better checking and attribute management on immutable (system) tags.
Merge branch 'maint/3.3/testing' of git.eucalyptus-systems.com:eucalyptus into maint/3.3/testing
EUCA-7273
Fire change on typing in the name box to activate button.
EUCA-7251
Fixed error message text.
EUCA-7289
This thing matches the DOM element by the text it contains, which has recently been escaped for XSS reasons. If the text contains special characters, like !<>? or the like, they get turned into HTML entities and don't match in the comparison anymore. Added bits in the comparison to turn them back into text to get a proper match.
Merge branch 'maint/3.3/testing' into testing