mbsync_read_pass: Show sync finished in STDOUT also

Signed-off-by: Gris Ge <cnfourt@gmail.com>
Delete unused script: ga

Signed-off-by: Gris Ge <cnfourt@gmail.com>
get_patch_from_maildir: Skip non-patch email

Signed-off-by: Gris Ge <cnfourt@gmail.com>