Begin fixing tests. Done with NormativeStorageAndCommandTestIT
refactor tests
Merge branch 'develop' of https://github.com/alien4cloud/alien4cloud-cloudify2-provider into features/ALIEN-464

Conflicts:
	src/main/java/alien4cloud/paas/cloudify2/generator/RecipeGenerator.java
	src/test/it/alien4cloud/paas/cloudify2/GenericTestCase.java
[ALIEN-464] fix tests
fixed broken tests
fixed tests on Normatives storage + now pass value as args
[ALIEN-464] update custom command triggering to handle functions inputs params
Added HOST, SOURCE_HOST and TARGET_HOST as env vars for scripts
- added PARENT env keyword, representing, for one node, the node hosting it
- added non required params and set them to null when triggering an operation
- refactor params validation
chenged manager url back to the value of env CLOUDIFY_URL in tests