Add support for otherName type in SANs

[jksmth]

I had a use case for needing to create node certificates with an otherName type in the SAN. I have submitted this PR in case this is something you would like to include in your project.

Example config:

nodes:
  - name: node1
    dn: CN=node1.example.com,OU=SSL,O=Test,L=Test,C=DE
    dns:
      - node1.example.com
      - localhost
    ip:
      - 127.0.0.1
    otherName:
      - oid: 2.5.4.3
        utf8: node-1.example.com