Convert DynamicGroupTest from groovy to java
Convert AttributeMapTest from groovy to java
Convert AttributeTest test from groovy to java
Convert GeoscalingScriptGeneratorTest from groovy to java
Convert BrooklynMetricsTest from groovy to java
Fix for failing ItemsInContainersGroupTest

- don’t do group.addMember if member is no longer managed
Fix NonDeploymentManagementContext.toString

- avoid StackOverflow in toString
- happened in circumstances where entity.toString called
  entity.getConfig, which called entity.getExecutionContext(), which
  threw an exception in checkInitialManagementContextReal, which
  tried to call NonDeploymentManagementContext.toString
Nginx: avoid repeated err logging if member has no host+port
This closes #2
This closes #3
This closes #4
This closes #8