lowercase the username input for emailaddy

lowercase the username input so the email address is valid for dovecot mail delivery. Fix confirmed bug referenced:
https://forums.cyberpanel.net/discussion/2345/creating-new-email-account-fail#latest

mailServer/mailserverManager.py

@@ -89,7 +89,7 @@ def submitEmailCreation(self):
 
             data = json.loads(self.request.body)
             domainName = data['domain']
-            userName = data['username']
+            userName = data['username'].lower()
             password = data['passwordByPass']
 
 
@@ -102,7 +102,7 @@ def submitEmailCreation(self):
 
             ## Create email entry
 
-            result = mailUtilities.createEmailAccount(domainName, userName, password)
+            result = mailUtilities.createEmailAccount(domainName, userName.lower(), password)
 
             if result[0] == 1:
                 data_ret = {'status': 1, 'createEmailStatus': 1, 'error_message': "None"}
@@ -679,4 +679,4 @@ def installStatusOpenDKIM(self):
         except BaseException, msg:
             final_dic = {'abort': 1, 'installed': 0, 'error_message': str(msg)}
             final_json = json.dumps(final_dic)
-            return HttpResponse(final_json)
+            return HttpResponse(final_json)