patchtest: utils: remove unused functions

Specifically, remove four things:

- get_subject_prefix(): This function is only being used once (in the next
function found in the module), so remove it for easier
comprehension/maintenance.
- exec_cmd: the backend for executing a custom command
- exec_cmds: for running multiple calls to exec_cmd
- CmdException: A custom exception class specifically for exec_cmd

These are only used to execute git commands, but GitPython can be used
to handle all of that more efficiently, so remove them.

(From OE-Core rev: e2fabdd6d53ee30a67992bd966961f423f18a388)

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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