Switch GIT_BASE to https://

Infra are looking at implementing gitea for serving git, but this does
not have a git protocol handler ATM.  Switch GIT_BASE, and some
testing, to https:// to be in a better position to handle this.

Change-Id: I97a7b0de7b1ec2dd15d15c58699a631b09273df1
Story: #2004627
Task: #29701
2 files changed