[go-borges] Fix tests in integration

[jfontan]

• Create branch in gitbase repository with the initial integration from https://github.com/jfontan/gitbase/tree/go-borges-go-rebased is go-borges-integration
• Tests from cmd/gitbase/command/server_test.go are still not modified to use go-borges. I'm not sure these are needed anymore.
• Tests that use closedSiva can not work with go-borges (testTableIndexIterClosed and testTableIterClosed). They may be moved to go-borges.
• TestRefsIterSiva fails and I'm not sure what's needed to make it work.

--- FAIL: TestRefsIterSiva (0.00s)
    --- FAIL: TestRefsIterSiva/all_refs (0.00s)
        require.go:97: 
            	Error Trace:	squash_iterator_test.go:989
            	Error:      	element [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] appears more times in [[/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3]] than in [[015da2f4-6d89-7ec8-5ac9-a38329ea875b HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [015da2f4-6d89-7ec8-5ac9-a38329ea875b refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3]]
            	Test:       	TestRefsIterSiva/all_refs
    --- FAIL: TestRefsIterSiva/repo_refs (0.00s)
        require.go:97: 
            	Error Trace:	squash_iterator_test.go:989
            	Error:      	element [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] appears more times in [[/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3]] than in [[015da2f4-6d89-7ec8-5ac9-a38329ea875b HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [015da2f4-6d89-7ec8-5ac9-a38329ea875b refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3]]
            	Test:       	TestRefsIterSiva/repo_refs
    --- FAIL: TestRefsIterSiva/remote_refs (0.00s)
        require.go:97: 
            	Error Trace:	squash_iterator_test.go:1013
            	Error:      	element [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] appears more times in [[/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3] [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3] [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [/home/jfontan/work/gitbase/_testdata/05893125684f2d3943cd84a7ab2b75e53668fba1.siva refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3]] than in [[015da2f4-6d89-7ec8-5ac9-a38329ea875b HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [015da2f4-6d89-7ec8-5ac9-a38329ea875b refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3] [015da2f4-6d89-7ec8-5ac9-a38329ea875b HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [015da2f4-6d89-7ec8-5ac9-a38329ea875b refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3] [015da2f4-6d89-7ec8-5ac9-a38329ea875b HEAD dbfab055c70379219cbcf422f05316fdf4e1aed3] [015da2f4-6d89-7ec8-5ac9-a38329ea875b refs/heads/master dbfab055c70379219cbcf422f05316fdf4e1aed3]]
            	Test:       	TestRefsIterSiva/remote_refs

[jfontan]

Now there's a branch in gitbase go-borges-integration.

[jfontan]

Fixed in #888