Update module github.com/gophercloud/gophercloud to v1.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/gophercloud/gophercloud	require	minor	v1.1.1 -> v1.2.0

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Release Notes

gophercloud/gophercloud

v1.2.0

Compare Source

Starting with this version, Gophercloud sends its actual version in the
user-agent string in the format gophercloud/v1.2.0. It no longer sends the
hardcoded string gophercloud/2.0.0.

• GH-2542 Add field hidden in containerinfra/v1/clustertemplates
• GH-2537 Support value_specs for Ports
• GH-2530 keystone: add v3 OS-FEDERATION mappings create operation
• GH-2519 Modify user-agent header to ensure current gophercloud version is provided

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[coveralls]

Coverage: 30.686%. Remained the same when pulling 2d7e09b on renovate/github.com-gophercloud-gophercloud-1.x into a7f3332 on master.