Add the dracut options to the lorax help output

Related: rhbz#1452220

src/pylorax/creator.py

@@ -45,7 +45,7 @@ from pylorax.installer import InstallError, novirt_install, virt_install
 
 RUNTIME = "images/install.img"
 
-# Default parameters for rebuilding initramfs, override with --dracut-args
+# Default parameters for rebuilding initramfs, override with --dracut-arg
 DRACUT_DEFAULT = ["--xz", "--add", "livenet dmsquash-live convertfs pollcdrom",
                   "--omit", "plymouth", "--no-hostonly", "--no-early-microcode"]
 

src/sbin/lorax

@@ -162,6 +162,7 @@ def main(args):
     # add the option groups to the parser
     parser.add_option_group(required)
     parser.add_option_group(optional)
+    parser.add_option_group(dracut_group)
 
     # add the show version option
     parser.add_option("-V", help="show program's version number and exit",