[aws|compute] remove :host from request parameters
[vcloud_director] Do ensure_list in request methods.

Mitigation for Fog::ToHashDocument. This is (still) a short-term fix
until we get to real response parsers.
Merge pull request #2262 from burns/aws_compute_excon_warning

[aws|compute] remove :host from request parameters
fix / escaping in AWS param signing

closes #2225
closes #2261
[aws|autoscaling] don't pass host to request

closes #2265
[vcloud_director] tests for #ensure_list!
Merge pull request #2266 from nosborn/vcloud_director_ensure_list

[vcloud_director] Do ensure_list in request methods.