This commit adds support for provisioning instances on demand with
vmpooler. Additionally, this change adds a capability to detect on
demand pools available in ABS. Without this change vmfloaty does not
support provisioning instances via the vmpooler ondemand endpoints.
Prior to this commit, the Pooler class would raise an exception if the
token provided was nil and it attempted to make a request with Faraday.
This fixes that by catching when nil tokens are provided and instead
raising a TokenError to be caught by the consumer.
This commit adds an errors class to handle when pooler tokens are
invalid. The retrieve method in Pooler will raise an AuthError if it
gets an HTTP 401 from the vmpooler.
Prior this commit, some commands did not accept some options as an
argument and instead only worked through a flag. This commit updates
that behavior to allow users to specify some options through arguments,
while leaving the ability to continue to specify those options through
flags. Command line arguments take precedence over flags. It also fixes
an issue where if a snapshot sha was nil, it would submit a request to
take a snapshot to vmpooler.
Prior to this commit, the pooler class was expecting a comma separated
string of hosts to delete. This commit updates that to expect hostnames
to be an array instead.
