Use base_module in clone_config
When cloning a module with a namespace, the `module` variable contains
the namespace prefix. As used in `clone_config` (specifically, as
currently used in `bz.default-component` and `sendemail.to`), the
namespace prefix is not intended to be part of the value.
For example:
$ fedpkg clone rpms/git
Cloning into 'git'...
...
$ cd git && git config --get-regexp 'bz.default-component|sendemail.to'
bz.default-component rpms/git
sendemail.to rpms/git-owner@fedoraproject.org
Use base_module for these values which strips the namespace prefix from
module.
Resolves: #230
Signed-off-by: Todd Zullinger <tmz@pobox.com>