Add go-toolset subpackage to ensure golang and go-toolset are published together

Carl Georgerequested to merge
carlwgeorge/centos_rpms_golang:c9s-go-toolset-subpackage into c9s

Merge Request Required Information

Summary of Changes

Add go-toolset subpackage to ensure golang and go-toolset are published together.

Approved Bugzilla Ticket

Resolves: rhbz#2117248

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