taas: use ssh_key_type from config for taas scenario

Closes-Bug: #1973755
Related-Bug: #1963907

Depends-On: https://review.opendev.org/c/openstack/neutron-fwaas/+/842254
Depends-On: https://review.opendev.org/c/openstack/tap-as-a-service/+/842134
Change-Id: I0d3021f32e71519721723548873a66523035fddd
1 file changed