Bockport all services of gophercloud into this repository

[freesky-edward]

What this PR does / why we need it:
This PR proposes to add all services of gophercloud support. the services includes:
** compute
** blockstorage
** db
** image
** objectstorage

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #
N/A
Special notes for your reviewer:

Release note:

[coveralls]

Pull Request Test Coverage Report for Build 199

• 6684 of 8636 (77.4%) changed or added relevant lines in 264 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+9.5%) to 69.693%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
openstack/imageservice/v2/imagedata/results.go	4	5	80.0%
openstack/networking/v2/extensions/networkipavailabilities/results.go	18	20	90.0%
openstack/compute/v2/extensions/serverusage/results.go	15	17	88.24%
openstack/blockstorage/extensions/schedulerstats/requests.go	13	15	86.67%
openstack/blockstorage/extensions/schedulerstats/results.go	38	40	95.0%
openstack/blockstorage/extensions/services/requests.go	13	15	86.67%
openstack/blockstorage/extensions/services/results.go	24	26	92.31%
openstack/networking/v2/subnets/results.go	25	27	92.59%
openstack/networking/v2/ports/results.go	27	29	93.1%
openstack/blockstorage/noauth/requests.go	26	28	92.86%

Totals
Change from base Build 190:	9.5%
Covered Lines:	10948
Relevant Lines:	15709

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 199

• 6684 of 8636 (77.4%) changed or added relevant lines in 264 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+9.5%) to 69.693%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
openstack/imageservice/v2/imagedata/results.go	4	5	80.0%
openstack/networking/v2/extensions/networkipavailabilities/results.go	18	20	90.0%
openstack/compute/v2/extensions/serverusage/results.go	15	17	88.24%
openstack/blockstorage/extensions/schedulerstats/requests.go	13	15	86.67%
openstack/blockstorage/extensions/schedulerstats/results.go	38	40	95.0%
openstack/blockstorage/extensions/services/requests.go	13	15	86.67%
openstack/blockstorage/extensions/services/results.go	24	26	92.31%
openstack/networking/v2/subnets/results.go	25	27	92.59%
openstack/networking/v2/ports/results.go	27	29	93.1%
openstack/blockstorage/noauth/requests.go	26	28	92.86%

Totals
Change from base Build 190:	9.5%
Covered Lines:	10948
Relevant Lines:	15709

---

💛 - Coveralls