Add --nomacboot option

sotime an OS would want to disable booting on mac machines. For
instance when buildinga RHEL clone where there is no hfs support.
The option disables mac support

src/bin/pungi.py

@@ -108,6 +108,8 @@ def main():
         config.set('pungi', 'lookaside_repos', " ".join(opts.lookaside_repos))
     if opts.no_dvd:
         config.set('pungi', 'no_dvd', "True")
+    if opts.nomacboot:
+        config.set('pungi', 'nomacboot', "True")
     config.set("pungi", "fulltree", str(bool(opts.fulltree)))
     config.set("pungi", "selfhosting", str(bool(opts.selfhosting)))
     config.set("pungi", "nosource", str(bool(opts.nosource)))
@@ -289,6 +291,7 @@ if __name__ == '__main__':
         parser.add_option("--relnotefilere", dest="relnotefilere", type="string",
           action="callback", callback=set_config, callback_args=(config, ),
           help='Which files are the release notes -- GPL EULA')
+        parser.add_option("--nomacboot", action="store_true", dest="nomacboot",           help='disable setting up macboot as no hfs support ')
 
 
         (opts, args) = parser.parse_args()

src/pypungi/__init__.py

@@ -1401,6 +1401,9 @@ class Pungi(pypungi.PungiBase):
 
         # Only supported mac hardware is x86 make sure we only enable mac support on arches that need it
         if self.tree_arch in ['x86_64']:
+            if self.config.getboolean('pungi','nomacboot'):
+                   domacboot = False
+            else:
                    domacboot = True
         else:
             domacboot = False

src/pypungi/config.py

@@ -53,3 +53,4 @@ class Config(SafeConfigParser):
         self.set('pungi', 'lookaside_repos', '')
         self.set('pungi', 'resolve_deps', "True")
         self.set('pungi', 'no_dvd', "False")
+        self.set('pungi', 'nomacboot', "False")