Added suspended audit state

New audit state SUSPENDED is added in this patch set. If audit
state with continuous mode is changed from ONGOING to SUSPENDED,
audit's job is removed and the audit is not executed.
If audit state changed from SUSPENDED to ONGOING in reverse,
audit is executed again periodically.

Change-Id: I32257f56a40c0352a7c24f3fb80ad95ec28dc614
Implements: blueprint suspended-audit-state

doc/source/architecture.rst

@@ -407,6 +407,9 @@ be one of the following:
 -  **CANCELLED** : the :ref:`Audit <audit_definition>` was in **PENDING** or
    **ONGOING** state and was cancelled by the
    :ref:`Administrator <administrator_definition>`
+-  **SUSPENDED** : the :ref:`Audit <audit_definition>` was in **ONGOING**
+   state and was suspended by the
+   :ref:`Administrator <administrator_definition>`
 
 The following diagram shows the different possible states of an
 :ref:`Audit <audit_definition>` and what event makes the state change to a new

doc/source/image_src/plantuml/audit_state_machine.txt

@@ -4,11 +4,14 @@
 PENDING --> ONGOING: Audit request is received\nby the Watcher Decision Engine
 ONGOING --> FAILED: Audit fails\n(no solution found, technical error, ...)
 ONGOING --> SUCCEEDED: The Watcher Decision Engine\ncould find at least one Solution
+ONGOING --> SUSPENDED: Administrator wants to\nsuspend the Audit
+SUSPENDED --> ONGOING: Administrator wants to\nresume the Audit
 FAILED --> DELETED : Administrator wants to\narchive/delete the Audit
 SUCCEEDED --> DELETED : Administrator wants to\narchive/delete the Audit
 PENDING --> CANCELLED : Administrator cancels\nthe Audit
 ONGOING --> CANCELLED : Administrator cancels\nthe Audit
 CANCELLED --> DELETED : Administrator wants to\narchive/delete the Audit
+SUSPENDED --> DELETED: Administrator wants to\narchive/delete the Audit
 DELETED --> [*]
 
 @enduml