be explicit about urllib import and remove conditional urllib(2) import

urllib and urllib2 have been in the python stdlib since at least
python-2.3.  There's no reason to conditionalize it.

Fixes https://github.com/ansible/ansible/issues/11322

lib/ansible/modules/extras/monitoring/airbrake_deployment.py

@@ -61,8 +61,7 @@ options:
     default: 'yes'
     choices: ['yes', 'no']
 
-# informational: requirements for nodes
-requirements: [ urllib, urllib2 ]
+requirements: []
 '''
 
 EXAMPLES = '''
@@ -72,6 +71,8 @@ EXAMPLES = '''
                        revision=4.2
 '''
 
+import urllib
+
 # ===========================================
 # Module execution.
 #

lib/ansible/modules/extras/monitoring/newrelic_deployment.py

@@ -72,8 +72,7 @@ options:
     choices: ['yes', 'no']
     version_added: 1.5.1
 
-# informational: requirements for nodes
-requirements: [ urllib, urllib2 ]
+requirements: []
 '''
 
 EXAMPLES = '''
@@ -83,6 +82,8 @@ EXAMPLES = '''
                        revision=1.0
 '''
 
+import urllib
+
 # ===========================================
 # Module execution.
 #

lib/ansible/modules/extras/monitoring/rollbar_deployment.py

@@ -76,6 +76,7 @@ EXAMPLES = '''
                       comment='Test Deploy'
 '''
 
+import urllib
 
 def main():