Minion-specific etcd values

This allows you to specify something such as the following in your
master config to get minion-specific values in etcd that may override
shared values.

    local_etcd:
      host: 127.0.0.1
      port: 4001

    ext_pillar:
      - etcd: local_etcd root=/salt-shared
      - etcd: local_etcd root=/salt-private/%(minion_id)s
Documenting minion-specific etcd ext_pillar
Updating docs to be in the third person
Merge pull request #12330 from s0undt3ch/develop

Bootstrap Script Updates
Adapt the test to the changes made in 3c284b1b6.
Merge pull request #12333 from s0undt3ch/hotfix/jenkins

Adapt the test to the changes made in 3c284b1b6.
Provide a custom keyring just for tests.

Properly skip tests.
Merge pull request #12334 from s0undt3ch/hotfix/jenkins

Provide a custom keyring just for tests.
Merge pull request #12329 from codekoala/develop

Minion-specific etcd pillar values
Use string formatting