**What**
- Support configuration the faas-cli configuration directory path via
the `OPENFAAS_CONFIG` env variable. When this value is set, the path
will be overridden. When empty, we will also check the CI flag, which
defaults the location to the current working directory. When neither
`OPENFAAS_CONFIG` or `CI` are set, then the default location is in
the current HOME folder.
- Various tests have been updated to use this new env variable instead
of modifying the global variables. Also, the variables are now
constants to prevent this kind of modiication in general.
Signed-off-by: Lucas Roesler <roesler.lucas@gmail.com>
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