ipaserver: Use Custodia instance in installers and setup before CA

Custodia is configured before CA and used in the setup of CA. Also add
support for name FIRST_MASTER as a replacement for MASTER_PEER.

This is related to the freeipa upstream commits:

Use single Custodia instance in installers:
  https://github.com/freeipa/freeipa/commit/994f71a
Rename CustodiaModes.STANDALONE to CustodiaModes.FIRST_MASTER:
  https://github.com/freeipa/freeipa/commit/842cb5f