Does planemo 0.72.0 test ignore PLANEMO_GLOBAL_WORKSPACE? It won't accept a --directory argument either

Using the test command in 0.72.0 and trying to force planemo to use a specific directory - not the default ~/.planemo

In cli.py there's an option:

```
@click.option('--directory',
default="~/.planemo",
envvar="PLANEMO_GLOBAL_WORKSPACE",
help="Workspace for planemo.")
```
test won't accept a --directory parameter. and ignores the envvar as far as I can tell

```
(venv) 1 ross@rosspn50:/tmp$ echo $PLANEMO_GLOBAL_WORKSPACE
/tmp/foo

(venv) ross@rosspn50:/tmp$ planemo test --directory /tmp/foo --galaxy_root ~/galthrow ~/rossgit/toolfactory/rgToolFactory2.xml
Usage: planemo test [OPTIONS] TOOL_PATH
Try 'planemo test --help' for help.

Error: no such option: --directory
```

but when I run test with the envvar set, it still tries to use /home/ross/.planemo/gx_venv_3 instead of /tmp/foo

```
(venv) ross@rosspn50:/tmp$ planemo test --galaxy_root ~/galthrow ~/rossgit/toolfactory/rgToolFactory2.xml
Testing using galaxy_root /home/ross/galthrow
Testing tools with command [cd /home/ross/galthrow && if [ -d .venv ] || [ -f dist-eggs.ini ]; then GALAXY_VIRTUAL_ENV=.venv; else **GALAXY_VIRTUAL_ENV=/home/ross/.planemo/gx_venv_3**; fi && export GALAXY_VIRTUAL_ENV && if [ ! -e "$GALAXY_VIRTUAL_ENV" ]; then /home/ross/venv/bin/virtualenv -p /home/ross/venv/bin/python3 $GALAXY_VIRTUAL_ENV; echo "Created virtualenv"; fi && if [ -e "$GALAXY_VIRTUAL_ENV" ]; then . "$GALAXY_VIRTUAL_ENV"/bin/activate; echo "Activated a virtualenv for Galaxy"; echo "$VIRTUAL_ENV"; else echo "Failed to activate virtualenv."; fi && sh run_tests.sh $COMMON_STARTUP_ARGS --report_file /tmp/tool_test_output.html --xunit_report_file /tmp/tmpcmdb0mkb/xunit.xml --structured_data_report_file /tmp/tool_test_output.json functional.test_toolbox]
galaxy.util.commands WARNING: Passing program arguments as a string may be a security hazard if combined with untrusted input
Activated a virtualenv for Galaxy
/home/ross/galthrow/.venv
Activating virtualenv at .venv
Requirement already satisfied: pip>=8.1 in ./.venv/lib/python3.6/site-packages (20.1)
^CERROR: Operation cancelled by user
WARNING: You are using pip version 20.1; however, version 20.2.4 is available.
You should consider upgrading via the '/home/ross/galthrow/.venv/bin/python -m pip install --upgrade pip' command.
```

Start in cli.py with the --directory option and reproduce the reported planemo test commands using --directory and PLANEMO_GLOBAL_WORKSPACE. Trace how the test command receives workspace settings; done means both the option and environment variable select the requested workspace instead of ~/.planemo.

Written by the indexing model from the issue text.