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/notification/flowdock.py

@@ -85,8 +85,7 @@ options:
     choices: ['yes', 'no']
     version_added: 1.5.1
 
-# informational: requirements for nodes
-requirements: [ urllib, urllib2 ]
+requirements: [ ]
 '''
 
 EXAMPLES = '''
@@ -104,6 +103,8 @@ EXAMPLES = '''
             tags=tag1,tag2,tag3
 '''
 
+import urllib
+
 # ===========================================
 # Module execution.
 #

lib/ansible/modules/extras/notification/grove.py

@@ -49,6 +49,8 @@ EXAMPLES = '''
     message=deployed {{ target }}
 '''
 
+import urllib
+
 BASE_URL = 'https://grove.io/api/notice/%s/'
 
 # ==============================================================

lib/ansible/modules/extras/notification/hipchat.py

@@ -62,8 +62,7 @@ options:
     version_added: 1.6.0
 
 
-# informational: requirements for nodes
-requirements: [ urllib, urllib2 ]
+requirements: [ ]
 author: "WAKAYAMA Shirou (@shirou), BOURDEL Paul (@pb8226)"
 '''
 
@@ -76,6 +75,7 @@ EXAMPLES = '''
 #
 
 MSG_URI = "https://api.hipchat.com/v1/rooms/message"
+import urllib
 
 def send_msg(module, token, room, msg_from, msg, msg_format='text',
              color='yellow', notify=False, api=MSG_URI):

lib/ansible/modules/extras/notification/nexmo.py

@@ -71,6 +71,7 @@ EXAMPLES = """
     msg: "{{ inventory_hostname }} completed"
 """
 
+import urllib
 
 NEXMO_API = 'https://rest.nexmo.com/sms/json'
 

lib/ansible/modules/extras/notification/sendgrid.py

@@ -84,10 +84,7 @@ EXAMPLES = '''
 # =======================================
 # sendgrid module support methods
 #
-try:
-    import urllib, urllib2
-except ImportError:
-    module.fail_json(msg="urllib and urllib2 are required")
+import urllib, urllib2
 
 import base64
 

lib/ansible/modules/extras/notification/twilio.py

@@ -104,10 +104,7 @@ EXAMPLES = '''
 # =======================================
 # twilio module support methods
 #
-try:
-    import urllib, urllib2
-except ImportError:
-    module.fail_json(msg="urllib and urllib2 are required")
+import urllib, urllib2
 
 import base64