How to use internal git repositories with Openshift

Issue

• How to use internal git repositories with Openshift Enterprise 3.
• Why do we see below error in build logs when using internal git repositories :

E0910 04:08:41.269929       1 git.go:127] fatal: unable to access 'https://xyz.abc.local/abc/bluegreen-PHP.git/': Peer's certificate issuer has been marked as not trusted by the user.
I0910 04:08:41.271306       1 clone.go:29] Git clone failed: exit status 128

• When using internal git repository below error is seen :

E0910 04:08:41.269929       1 git.go:127] fatal: unable to access 'https://<Repository-name>/bluegreen-PHP.git/': Peer's certificate issuer has been marked as not trusted by the user.
I0910 04:08:41.271306       1 clone.go:29] Git clone failed: exit status 128