Drop some config options that are no longer used.

WARNING: Config option release_is_layered was removed and has no effect;
remove it. It's layered if there's configuration for base product.
WARNING: Config option runroot was removed and has no effect; remove it.
Please specify 'runroot_method' if you want to enable runroot, otherwise run
things locally.
WARNING: Config option bootable was removed and has no effect; remove it.
Setting buildinstall_method option if you want a bootable installer.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

fedora.conf

@@ -2,10 +2,8 @@
 release_name = 'Fedora'
 release_short = 'Fedora'
 release_version = 'Rawhide'
-release_is_layered = False
 
 # GENERAL SETTINGS
-bootable = True
 comps_file = {
     'scm': 'git',
     'repo': 'https://pagure.io/fedora-comps.git',
@@ -34,7 +32,7 @@ tree_arches = ['aarch64', 'armhfp', 'ppc64le', 's390x', 'x86_64']
 hashed_directories = True
 
 # RUNROOT settings
-runroot = True
+runroot_method = 'koji'
 runroot_channel = 'compose'
 runroot_tag = 'f32-build'