golang: bump github.com/hashicorp/go-multierror from 1.0.0 to 1.1.1 in /tools/metrics #3158

Job	Run time
tests (lint)	2m 1s
tests (config_spec)	3m 16s
tests (tools_spec)	1m 32s
tests (concourse_spec)	1m 16s
tests (manifests_spec)	2m 57s
tests (terraform_spec)	1m 16s
tests (platform_tests_spec)	1m 9s
tests (compile_platform_tests)	1m 5s
	14m 32s

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