add module docstrings and improve exit handling

wile_coyote/__init__.py

wile_coyote/acme/__init__.py

wile_coyote/acme/nomad_uploader.py

wile_coyote/acme/uploader.py

wile_coyote/acme/wildcard_uploader.py

wile_coyote/bin/anvil

wile_coyote/bin/coyote

wile_coyote/common/__init__.py

wile_coyote/common/combine.py

wile_coyote/common/config.py

wile_coyote/common/constants.py

wile_coyote/common/log.py

wile_coyote/common/sys_kit.py

wile_coyote/tools/consul_kit.py

wile_coyote/tools/key_kit.py

wile_coyote/tools/redis_kit.py

wile_coyote/tools/vault_kit.py