Fix git tests locally.

These tests failed if GIT env vars are set locally.

Author: rcorre

Diff for: octobot/tests/git_helper/temp_git.rs

@@ -22,6 +22,10 @@ impl TempGit {
         std::env::set_var("HOME", &home);
         std::env::set_var("XDG_CONFIG_HOME", &home);
 
+        // These will interfere with tests run locally
+        std::env::remove_var("GIT_AUTHOR_NAME");
+        std::env::remove_var("GIT_AUTHOR_EMAIL");
+
         let dir = tempdir().expect("create temp dir for git_test.rs");
 
         let repo_dir = dir.path().join("repo");