Clarifies procedure for a git clone with a self-signed TLS certificate
Clarifies procedure for a git clone with a self-signed TLS certificate

This update clarifies the procedure for adding a CA certificate to allow
doing a git clone over https using a self-signed or otherwise un-trusted
TLS certificate

Also re-arranged the Git Source section to be easier to read and link to

Trello card: https://trello.com/c/Ajm1E1Qi/1038-1-make-it-easier-to-provide-a-trusted-ca-cert-for-cloning-builds-techdebt

xiaoping378/openshift-docs,xiaoping378/openshift-docs,xiaoping378/openshift-docs