Added / to the regexp

Added regex and moved X-*-Region to the context

Sometimes instance_id in the URI can have characters such as : or / which are all valid, but
due to gorilla/mux we can land in a 404 not found issue. Added a Regex to the {instance_id} route
thus allowing such instance_id.
Added a middleware layer to parse X(*)-Region to the context under the X-Region key

Signed-off-by: Tapas Sharma <[email protected]>

Added proper middleware imports

Merge branch 'upstream_master'

dded AdditionalMetadata to the catalog.Service struct

- pass more information regarding different cloud providers.

Signed-off-by: Tapas Sharma <[email protected]>

Add MaintenanceInfo to provision request struct

[#162013007]

Add Private section to maintenance_info [#161091710]

Fix broken tests [#161091710]

Co-authored-by: Derik Evangelista <[email protected]>

Make `Public` a map[string]string

Due to go-yaml/yaml/139, we don't want the maintenance_info.public to
have nested fields.

[#161091710]

catalog has new field maintenance_info

[#161091710]