Fix tls-proxy on newer versions of openssl

Newer versions of openssl (CentOS9Stream for example) do not like using sha1.
Devstack will fail on these systems[1] with the following error:
801B93DCE77F0000:error:03000098:digital envelope routines:do_sigver_init:invalid digest:crypto/evp/m_sigver.c:333:
This patch updates the tls-proxy code in devstack to use sha256 instead of sha1 which allows devstack to complete when tls-proxy is enabled.

[1] https://zuul.opendev.org/t/openstack/build/1d90b22a39c74e24a8390861b3c5f957/log/job-output.txt#5535

Closes-Bug: #1962600

Change-Id: I71e1371affe32f070167037b0109a489d196bd31
1 file changed