Add API integration tests for actions

Added positive and negative API tests for 'actions'
endpoint.

Change-Id: I6e5fdb83359371e53c28873b74a77138dd38b6fe
Fix creating objects with the same names

 * Fixed unit-tests
 * Added new unit-tests
 * default project_id = <default_project>

Closes-bug #1385275

Change-Id: I65e239fe471117f5b11cfb56fec92e90083fe50b
Refactoring getting one object from DB

Change-Id: If8d3b01c241dd64f1e5c095634697d2a120df201
Updating AUTHORS file

Change-Id: Iac7e17e1350381bcd6717b5e6de375a3c79149af
Merge "Fix creating objects with the same names"
Merge "Refactoring getting one object from DB"
Merge "Add API integration tests for actions"
Implement for-each task property

 * Unit test

Implements blueprint mistral-dataflow-collections

Change-Id: I10aa1a71ead3d7a7ad6dc29c1f210b57fbd32264
Add possibility to pass variables from context to for-each

 * Merge input_context and action_input for
   calculating full action input

Change-Id: I85dd1c73f5ebb61675ed673967ccfd1627c16950
Add cinder actions

 * Mistral now includes all Cinder actions
 * Unit tests

Change-Id: Ia663df09ae15f8154d49bbf232118617f92cba30
Fill 'wf_name' task_db field

 * Now wf_name is shown correctly in task CLI commands

Closes-bug: #1388013

Change-Id: I8a07c4f377e44153905c0b93da5dfc1fef518337
Merge "Fill 'wf_name' task_db field"
Add 'project_id' to Execution and Task

 * this allows to filter executions and task
   by project (like it was done with workbooks,
   workflows and actions)

Partially implements blueprint mistral-multitenancy

Closes-bug: #1384552

Change-Id: I1e1cc338ebd594853f17a824cfabf0d9efa3a405
Sort executions and tasks by time

Closes-bug: #1391118

Change-Id: I8417c3679350c40f73faff22bd82d9549845fe25
Update README files

- Provided link to the instruction with devstack installation
- Extended info about devstack installation

Change-Id: Ic292f6f6b6be1294eb2bf72d59de251f1675ffad
Refactor std.email action

Closes-bug: #1392652

Change-Id: I308b28aae758b2b99b5ae5f39f8f74743544f00a
Merge "Add 'project_id' to Execution and Task"
Merge "Refactor std.email action"
Merge "Implement for-each task property"
Merge "Add possibility to pass variables from context to for-each"