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
add support for last-modified-date for persistent store objects, and use that to determine which mgmt nodes are live
address code review comments from brooklyncentral/brooklyn#1464 - mainly tidying up names and logging
Use findUniqueSshMachineLocation helper in SshFeed
Set summary for MachineEntity ssh task
ensure effector tasks are always tagged appropriately, fixing bug where some direct invocations did not get tagged correctly and would be GC'd immediately on completion, and adding test
env vars for ssh commands on task and in gui
add an "only if service up" mode to several sensor feeds (the ones most likely to be configured ahead of time),
and just-in-time inferene for ssh-feeds with test
don't include extra output in SshFeed calls
trim strings before coercing to numbers
add support for SshFeed to take a dynamic supplier of command and environment so that these can change (eg incorporating parameters server-side or setting shell env vars to latest sensor values), plus test
entity-initializers for ssh commands (sensors and effectors) and framework for others we might want to set up, including parameters and period and env set for sensors
docs for entity intializers, ssh sensors and effectors, and example with nice integration test