Blueprint names can only contain alphanumeric characters and the characters: ._-. This test checks that an api request to create a blueprint with invalid characters in its name will return an InvalidChars error.
The VALID_API_STRING function allows for characters that should not be
allowed in blueprint names. VALID_BLUEPRINT_NAME allows us to
specifically check if a blueprint contains a valid name.
Test the HTTP API directly from outside the VM by forwarding
/run/weldr/api.socket to a TCP port on the host.
This is only a start to test that the API always returns JSON (see
previous commit).
