`bzl release` fails if .bzlrc contains "common --base_dir=/var/tmp"

```
$ bzl release --help
Error: unknown flag: --base_dir
unknown flag: --base_dir
Usage:
  bzl release [flags]

Flags:
  -h, --help   help for release
```

```
$ cat ~/.bzlrc 
common --base_dir=/tmp/bzl
serve --http_port=9999
```

once the config is removed the command works:

```
$ bzl release
v0.8.1
```