Tidy up validate-modules ignores for notification modules (#1229)

* fixed validation-modules for plugins/modules/notification/bearychat.py

* fixed validation-modules for plugins/modules/notification/campfire.py

* fixed validation-modules for plugins/modules/notification/catapult.py

* fixed validation-modules for plugins/modules/notification/flowdock.py

* fixed validation-modules for plugins/modules/notification/grove.py

* fixed validation-modules for plugins/modules/notification/hipchat.py

* fixed validation-modules for plugins/modules/notification/irc.py

* fixed validation-modules for plugins/modules/notification/jabber.py

* fixed validation-modules for plugins/modules/notification/logentries_msg.py

* fixed validation-modules for plugins/modules/notification/mail.py

* fixed validation-modules for plugins/modules/notification/matrix.py

* fixed validation-modules for plugins/modules/notification/mattermost.py

* fixed validation-modules for plugins/modules/notification/mqtt.py

* fixed validation-modules for plugins/modules/notification/nexmo.py

* fixed validation-modules for plugins/modules/notification/office_365_connector_card.py

* fixed some docs issues in plugins/modules/notification/pushbullet.py, but cannot remove the ignore lines yet

* fixed validation-modules for plugins/modules/notification/pushover.py

* fixed some docs issues in plugins/modules/notification/rocketchat.py, but cannot remove all ignore lines yet

* fixed validation-modules for plugins/modules/notification/say.py

* fixed validation-modules for plugins/modules/notification/sendgrid.py

* fixed validation-modules for plugins/modules/notification/slack.py

* fixed validation-modules for plugins/modules/notification/syslogger.py

* fixed validation-modules for plugins/modules/notification/telegram.py

* fixed validation-modules for plugins/modules/notification/twilio.py

* fixed validation-modules for plugins/modules/notification/typetalk.py

* Enabling validation-modules for modules in: notification

* removed naughty trailing space

plugins/modules/notification/slack.py

@@ -22,11 +22,13 @@ description:
 author: "Ramon de la Fuente (@ramondelafuente)"
 options:
   domain:
+    type: str
     description:
       - Slack (sub)domain for your environment without protocol. (i.e.
         C(example.slack.com)) In 1.8 and beyond, this is deprecated and may
         be ignored.  See token documentation for information.
   token:
+    type: str
     description:
       - Slack integration token. This authenticates you to the slack service.
         Make sure to use the correct type of token, depending on what method you use.
@@ -50,11 +52,13 @@ options:
         See Slack's documentation (U(https://api.slack.com/docs/token-types)) for more information."
     required: true
   msg:
+    type: str
     description:
       - Message to send. Note that the module does not handle escaping characters.
         Plain-text angle brackets and ampersands should be converted to HTML entities (e.g. & to &) before sending.
         See Slack's documentation (U(https://api.slack.com/docs/message-formatting)) for more.
   channel:
+    type: str
     description:
       - Channel to send the message to. If absent, the message goes to the channel selected for the I(token).
   thread_id:
@@ -68,17 +72,22 @@ options:
     type: str
     version_added: 1.2.0
   username:
+    type: str
     description:
       - This is the sender of the message.
     default: "Ansible"
   icon_url:
+    type: str
     description:
       - Url for the message sender's icon (default C(https://www.ansible.com/favicon.ico))
+    default: https://www.ansible.com/favicon.ico
   icon_emoji:
+    type: str
     description:
       - Emoji for the message sender. See Slack documentation for options.
         (if I(icon_emoji) is set, I(icon_url) will not be used)
   link_names:
+    type: int
     description:
       - Automatically create links for channels and usernames in I(msg).
     default: 1
@@ -86,6 +95,7 @@ options:
       - 1
       - 0
   parse:
+    type: str
     description:
       - Setting for the message parser at Slack
     choices:
@@ -98,12 +108,14 @@ options:
     type: bool
     default: 'yes'
   color:
+    type: str
     description:
       - Allow text to use default colors - use the default of 'normal' to not send a custom color bar at the start of the message.
       - Allowed values for color can be one of 'normal', 'good', 'warning', 'danger', any valid 3 digit or 6 digit hex color value.
       - Specifying value in hex is supported since Ansible 2.8.
     default: 'normal'
   attachments:
+    type: list
     description:
       - Define a list of attachments. This list mirrors the Slack JSON API.
       - For more information, see U(https://api.slack.com/docs/attachments).