Removes SSH keys
Use brooklyn.properties and a BasicLocationRegistry to obtain a JcloudsLocatrion

Conflicts:
	software/messaging/src/test/java/brooklyn/entity/messaging/activemq/ActiveMQEc2LiveTest.groovy
	software/webapp/src/test/java/brooklyn/entity/proxy/nginx/NginxAmazonTest.groovy
	software/webapp/src/test/java/brooklyn/entity/webapp/WebAppLiveIntegrationTest.groovy
Use non-deprecated location resolver
Conflicts:
	core/src/main/java/brooklyn/entity/basic/Entities.java
	core/src/main/java/brooklyn/management/internal/LocalManagementContext.java
	software/webapp/src/test/java/brooklyn/entity/proxy/nginx/NginxAmazonTest.groovy
Fix Jclouds tests to use non-deprecated code
Further work fixing JcloudsLocation based tests
Merge pull request #500 from grkvlt/ssh-key-removal-impl

Ssh key removal