pwcli: store pending branch commit id to temp_ref
pwcli: store pending branch commit id to temp_ref

This way the temporary pending branch commit id is not stored on the patchwork
and hence exposed to users.

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

kvalo/pwcli,kvalo/pwcli