Revert "Merge pull request #187 from jenkinsci/JENKINS-14026"

This reverts commit a67bbc0, reversing
changes made to b75d1e2.

src/main/java/hudson/plugins/git/GitSCM.java

@@ -435,10 +435,6 @@ private String getSingleBranch(EnvVars env) {
        // Check for empty string - replace with "**" when seen.
        if (branch.equals("")) {
            branch = "**";
        } else if (!branch.startsWith(repository)) {
            // we can hit this case if the given branch name contains a slash.
            // Since we have a single repository, it makes sense to prepend it anyway
            branch = repository + "/" + branch;
        }

        return branch;

src/test/java/hudson/plugins/git/GitSCMTest.java

@@ -494,20 +494,6 @@ public void testBranchIsAvailableInEvironment() throws Exception {
        assertEquals("origin/master", getEnvVars(project).get(GitSCM.GIT_BRANCH));
    }

    public void testBranchContainsSlash() throws Exception {
      FreeStyleProject project = setupSimpleProject("my/branch");

      final String commitFile1 = "commitFile1";
      commit(commitFile1, johnDoe, "Commit number 1");
      git.branch("my/branch");
      git.checkout("my/branch");
      final String commitFile2 = "commitFile2";
      commit(commitFile2, johnDoe, "Commit number 2");
      build(project, Result.SUCCESS, commitFile1, commitFile2);

      assertEquals("origin/my/branch", getEnvVars(project).get(GitSCM.GIT_BRANCH));
    }

    // For HUDSON-7411
    public void testNodeEnvVarsAvailable() throws Exception {
        FreeStyleProject project = setupSimpleProject("master");