Detect dynamic mgmt port. Fixes gh-561

[chriswhite199]

Ignoring the checkstyle auto-fixed whitespace changes, see:

• spring-cloud-commons/src/main/java/org/springframework/cloud/client/serviceregistry/AbstractAutoServiceRegistration.java - Capture management web server init event & wait for ApplicationReadyEvent before starting registration (to ensure that http & optional mgmt ports have been discovered)
• spring-cloud-commons/src/test/java/org/springframework/cloud/client/serviceregistry/AbstractAutoServiceRegistrationMgmtDisabledTests.java - updated correct property for mgmt port
• spring-cloud-commons/src/test/java/org/springframework/cloud/client/serviceregistry/AbstractAutoServiceRegistrationTests.java - updated correct property for mgmt port

[spencergibb]

I'm afraid we need to revert all the formatting changes

[chriswhite199]

@spencergibb - so what am i doing wrong when running mvn install, as that appears to be the cause of the re-formatting. I'll revert the whitespace changes

[spencergibb]

Nothing wrong. We just need to apply the formatting separately.

[spencergibb]

Reverted via 4995ffc.

In spring-cloud-consul, tests started failing as start() was called before bind().