Add support for another SlapOS master.

slapprepare/slapprepare/slapprepare.py

@@ -444,13 +444,22 @@ class Config:
 
   def userConfig(self):
     # XXX-Testme: test each possible scenario
+    # XXX don't use self.xx but return a dict so that it is stateless
+    #     and easy to test
+    # XXX rename "get_yes_no" so that we don't have insane cases like
+    #     "if not get_yes_no('...')"
     already_configured = getSlaposConfiguration()
-    self.certificates = get_yes_no("Automatically register new computer to slapos.org?", True)
+    self.certificates = get_yes_no("Automatically register new computer to a SlapOS Master?", True)
     if self.certificates:
       if already_configured:
         if not get_yes_no("A SlapOS Node configuration has been found. Do you want to overwrite it?", False):
           print "Okay, let's start from scratch."
           return False
+      self.master_url = raw_input("""SlapOS Master URL? Empty answer will make it use slapos.org :""")
+      if self.master_url:
+        self.master_url_web = raw_input("""SlapOS Master "web" URL? Default is "https://www.slapos.org" :""")
+      else:
+        self.master_url_web = ''
       self.computer_name = raw_input("Define a unique name for this computer: ")
       self.partition_amount = raw_input("""Number of SlapOS partitions for this computer? Default is 20 :""")
       if self.partition_amount == '':