Ensure exit_json returns failed = False

This is required for modules that may return a non-zero `rc` value for a
successful run, similar to #24865 for Windows fixing **win_chocolatey**.

We also disable the dependency on `rc` value only, even if `failed` was
set.

Adapted unit and integration tests to the new scheme.
Updated raw, shell, script, expect to take `rc` into account.

test/integration/roles/test_ec2_eip/tasks/main.yml

@@ -111,7 +111,6 @@
 - name: assert new EIP was assigned
   assert:
     that:
-      - '"failed" not in result'
       - '"public_ip" in result'
 
 
@@ -128,10 +127,6 @@
     instance_id={{ instance_id }}
   register: result
 
-- name: assert success disassociate EIP associated with instance
-  assert:
-    that:
-      - '"failed" not in result'
 
 # eip allocated:1 assigned:0
 
@@ -152,7 +147,6 @@
 - name: assert new EIP was assigned
   assert:
     that:
-      - '"failed" not in result'
       - '"public_ip" in result'
 
 
@@ -176,11 +170,6 @@
     ec2_secret_key={{ ec2_secret_key }}
   register: result
 
-- name: assert EIP deactivated
-  assert:
-    that:
-      - '"failed" not in result'
-
 
 # eip allocated:0 assigned:0
 
@@ -205,7 +194,6 @@
 - name: assert provision EIP with instance_id
   assert:
     that:
-      - '"failed" not in result'
       - '"public_ip" in result'
 
 
@@ -245,7 +233,6 @@
 - name: assert VPC EIP creation
   assert:
     that:
-      - '"failed" not in result'
       - '"public_ip" in result'
 
 
@@ -268,7 +255,6 @@
 #- name: assert new VPC EIP was assigned
 #  assert:
 #    that:
-#      - '"failed" not in result'
 #      - '"public_ip" in result'
 #
 #
@@ -307,7 +293,6 @@
 - name: assert environment variable EC2_REGION
   assert:
     that:
-      - '"failed" not in result'
       - '"public_ip" in result'