commands/operator-sdk/cmd/new.go: quiet initial git commit

"fatal: write failure on 'stdout': Bad file descriptor" error is encountered by some users because the output fd is nil. This commit allows `git commit` to print to stdout but quietly. fixing the error.

Fixes #363

Author: estroz

commands/operator-sdk/cmd/new.go

@@ -181,6 +181,6 @@ func initGit() {
 	fmt.Fprintln(os.Stdout, "Run git init ...")
 	execCmd(os.Stdout, "git", "init")
 	execCmd(os.Stdout, "git", "add", "--all")
-	execCmd(nil, "git", "commit", "-m", "INITIAL COMMIT")
+	execCmd(os.Stdout, "git", "commit", "-q", "-m", "INITIAL COMMIT")
 	fmt.Fprintln(os.Stdout, "Run git init done")
 }