scm: Fix git clone issue for git+http protocol

`git clone` failed if the URL is specified as git+http.

    git: 'remote-git+http' is not a git command. See 'git --help'.

JIRA: RHELCMP-14340
Signed-off-by: Haibo Lin <hlin@redhat.com>

pungi/wrappers/scm.py

@@ -160,6 +160,9 @@ class GitWrapper(ScmBase):
         if "://" not in repo:
             repo = "file://%s" % repo
 
+        if repo.startswith("git+http"):
+            repo = repo[4:]
+
         git_cmd = ["git"]
         if "credential_helper" in self.options:
             git_cmd.extend(["-c", "credential.useHttpPath=true"])