stubs: stg: fix the commit id to be stable
stubs: stg: fix the commit id to be stable

When using email.message.Message.as_string() to create the mbox python adds a
date to the first line. Strip that out from making the sha1 has so that commit
ids remain stable.

Signed-off-by: Kalle Valo <7081a7d99b8c74c0698a728df19e3915a995d7e1@codeaurora.org>

kvalo/pwcli,kvalo/pwcli