run-gdb-user: killed it, all that was needed was to pass --userland

Fixes part of https://github.com/cirosantilli/linux-kernel-module-cheat/issues/63

run-gdb

@@ -149,13 +149,15 @@ the script is a .py file next to the source code.
             break_at = ['-ex', 'break {}'.format(self.env['break_at']), LF]
         else:
             break_at = []
-        linux_full_system = (self.env['baremetal'] is None and self.env['userland'] is None)
         if self.env['userland']:
             image = self.env['image']
+            linux_full_system = False
         elif self.env['baremetal']:
             image = self.env['image']
+            linux_full_system = False
         else:
             image = self.env['vmlinux']
+            linux_full_system = True
         cmd = (
             [self.env['gdb_path'], LF] +
             before