paas-metrics acceptance tests to not update deps
paas-metrics acceptance tests to not update deps

When you run 'go get' inside a directoy with go.mod it will update
go.mod and go.sum but not vendor/modules.txt

So if there is a ginkgo update and we 'go get' it we will then have
differing versions in go.mod and vendor/modules.txt which will not
compile

If we install ginkgo before changing directory, then go.mod does not get
updated and the tests run normally

Signed-off-by: Toby Lorne <527052641d65eef236eeef9545b2acac74c35d57@digital.cabinet-office.gov.uk>

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf