now you have the option to NOT set the password if the user already exists,

this works well for 'initial password setting' on user creation and avoids
having extra tasks and conditionals.
Signed-off-by: Brian Coca <briancoca+dev@gmail.com>

system/user

@@ -158,6 +158,18 @@ options:
             - Set a passphrase for the SSH key.  If no
               passphrase is provided, the SSH key will default to
               having no passphrase.
+    update_password:
+        required: false
+        default: always
+        choices: ['always', 'on_creation']
+        version_added: "1.3"
+        description:
+            - Control when does ansible update passwords.
+            C(always) will update if they differ.
+            C(on_creation) will only update the password if user is being created.
+examples:
+    - code: 'user: name=johnd comment="John Doe" uid=1040'
+      description: "Add the user 'johnd' with a specific uid and a primary group of 'admin'"
 examples:
     - code: 'user: name=johnd comment="John Doe" uid=1040'
       description: "Add the user 'johnd' with a specific uid and a primary group of 'admin'"
@@ -226,6 +238,7 @@ class User(object):
         self.ssh_type   = module.params['ssh_key_type']
         self.ssh_comment = module.params['ssh_key_comment']
         self.ssh_passphrase = module.params['ssh_key_passphrase']
+        self.update_password = module.params['update_password']
         if module.params['ssh_key_file'] is not None:
             self.ssh_file = module.params['ssh_key_file']
         else:
@@ -357,7 +370,7 @@ class User(object):
             cmd.append('-s')
             cmd.append(self.shell)
 
-        if self.password is not None and info[1] != self.password:
+        if self.update_password == 'always' and self.password is not None and info[1] != self.password:
             cmd.append('-p')
             cmd.append(self.password)
 
@@ -690,7 +703,7 @@ class FreeBsdUser(User):
             (rc, out, err) = (None, '', '')
 
         # we have to set the password in a second command
-        if self.password is not None and info[1] != self.password:
+        if self.update_password == 'always' and self.password is not None and info[1] != self.password:
             cmd = [
                 self.module.get_bin_path('chpass', True),
                 '-p',
@@ -836,7 +849,7 @@ class OpenBSDUser(User):
             cmd.append('-L')
             cmd.append(self.login_class)
 
-        if self.password is not None and info[1] != self.password:
+        if self.update_password == 'always' and self.password is not None and info[1] != self.password:
             cmd.append('-p')
             cmd.append(self.password)
 
@@ -989,7 +1002,7 @@ class NetBSDUser(User):
             cmd.append('-L')
             cmd.append(self.login_class)
 
-        if self.password is not None and info[1] != self.password:
+        if self.update_password == 'always' and self.password is not None and info[1] != self.password:
             cmd.append('-p')
             cmd.append(self.password)
 
@@ -1154,7 +1167,7 @@ class SunOS(User):
             (rc, out, err) = (None, '', '')
 
         # we have to set the password by editing the /etc/shadow file 
-        if self.password is not None and info[1] != self.password:
+        if self.update_password == 'always' and self.password is not None and info[1] != self.password:
             try:
                 lines = []
                 for line in open(self.SHADOWFILE, 'rb').readlines():
@@ -1303,7 +1316,7 @@ class AIX(User):
             (rc, out, err) = self.execute_command(cmd)
 
         # set password with chpasswd
-        if self.password is not None and info[1] != self.password:
+        if self.update_password == 'always' and self.password is not None and info[1] != self.password:
             cmd = []
             cmd.append('echo "'+self.name+':'+self.password+'" |')
             cmd.append(self.module.get_bin_path('chpasswd', True))
@@ -1354,7 +1367,8 @@ def main():
             ssh_key_type=dict(default=ssh_defaults['type'], type='str'),
             ssh_key_file=dict(default=None, type='str'),
             ssh_key_comment=dict(default=ssh_defaults['comment'], type='str'),
-            ssh_key_passphrase=dict(default=None, type='str')
+            ssh_key_passphrase=dict(default=None, type='str'),
+            update_password=dict(default='always',choices=['always','on_create'],type='str')
         ),
         supports_check_mode=True
     )