add RTS software config and deployment services interface support

[frisky-dis]

What this PR does / why we need it: This PR adds RTS software config and deployment services interfaces

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer: None

Release note: None

[coveralls]

Pull Request Test Coverage Report for Build 163

• 155 of 220 (70.45%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.7%) to 66.297%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
openstack/rts/v1/softwaredeployment/results.go	25	27	92.59%
openstack/rts/v1/softwareconfig/results.go	25	27	92.59%
openstack/rts/v1/softwareconfig/requests.go	40	66	60.61%
openstack/rts/v1/softwaredeployment/requests.go	53	88	60.23%

Totals
Change from base Build 156:	0.7%
Covered Lines:	2992
Relevant Lines:	4513

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💛 - Coveralls

[freesky-edward]

LGTM, should #36 be closed?

[Savasw]

There is no dependency as such but it would be good to merge #36 first if possible