Fix broken st2-self-check script

[Kami]

This pull request fixes an issue introduced in #150 which I described here - #150 (comment).

tests pack is only used for end to end and st2-self-check script tests. As such, all the actions inside that pack should follow that action format.

To fix the issue, I made the following changes:

1. Moved new action inside fixtures pack - that's where "fixture" actions should live
2. Added new tests.test_render_config_context action which uses the fixture action and tests render config context functionality

This will also require changed in StackStorm/st2 repo. We can likely get rid of all the "clone st2tests" pack change from this PR - StackStorm/st2#4567.

[Kami]

Confirmed it's working:

Deleting 'st2tests' directory from /home/ubuntu.
~
Attempting Test tests.test_inquiry_chain...OK! (47s)
Attempting Test tests.test_inquiry_mistral...OK! (49s)
Attempting Test tests.test_key_triggers...OK! (33s)
Attempting Test tests.test_pack_install_tool...OK! (10s)
Attempting Test tests.test_packs_pack...OK! (76s)
Attempting Test tests.test_quickstart...OK! (21s)
Attempting Test tests.test_quickstart_key...OK! (6s)
Attempting Test tests.test_quickstart_local_script_actions...OK! (13s)
Attempting Test tests.test_quickstart_passive_sensor...OK! (7s)
Attempting Test tests.test_quickstart_polling_sensor...OK! (4s)
Attempting Test tests.test_quickstart_python_actions...OK! (11s)
Attempting Test tests.test_quickstart_remote_script_actions...OK! (14s)
Attempting Test tests.test_quickstart_rules...OK! (62s)
Attempting Test tests.test_quickstart_trace...OK! (16s)
Attempting Test tests.test_render_config_context...OK! (5s)

[jinpingh]

@Kami Not sure how it is working for moving packs/tests/actions/render_config_context.py → packs/fixtures/render_config_context.py
Should it be moved under packs/fixtures/actions directory?

If action is moved to fixtures pack, it will break https://github.com/StackStorm/st2/blob/master/st2tests/integration/orquesta/test_wiring.py integration test case test_config_context_renders. https://github.com/StackStorm/st2/blob/master/contrib/examples/actions/workflows/render_config_context.yaml and https://github.com/StackStorm/st2/blob/master/tools/launchdev.sh need to be changed.

[Kami]

@Kami Not sure how it is working for moving packs/tests/actions/render_config_context.py → packs/fixtures/render_config_context.py
Should it be moved under packs/fixtures/actions directory?

Yeah, I've fixed that locally already, but haven't pushed the changes yet - I've pushed them now.

I will look into the StackStorm/st2 change - one option would be to simply move that action to the examples pack (IIRC, we already have a similar action there).

[Kami]

I've pushed latest changes.

Per our discussion on Slack, I moved action to fixtures pack StackStorm/st2#4625.