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Support for DelegationUsage extension

This special cases the DelegationUsage extension, copying it to the
output when signing. It also adds support for a flag
delegation_enabled in certificate specifications. I have manually
confirmed this works.

The root of the problem is that the latest semver release of https://github.com/google/certificate-transparency-go is from 2018, and the etcd packages have been renamed since. For some reason the readme instructs the usage of `-u` with go get, so this upgrades that to the latest version, along with some other packages that are years out of date.

more context at: https://github.com/etcd-io/etcd/issues/11749

resolves #1142, 
resolves #1182
resolves #1183
resolves #1188

Support for E attribute (emailAddress) in CSR

Add http response close in client post function

replace deprecated go-metrics with prometheus

This _is_ a breaking change.

revoke: fix connection leak

Fix tests and add OID test

fix error check when check signature

Allow users to use custom HTTP client

format json indent

Add Power Support ppc64le