(cherry picked from commit 8f2102d)

We should be able to deploy a NixOS 18.03 system with the current nixops
stable release. Some options were renamed, so instead of
`mkRenamedOptionModule` we introduce them as read-only interal options
that won't be rendered in the manual.

Only the options that are needed to make nixops evaluations succeed were
added.

This commit should probably be reverted after or before the 18.09 release,
depending on the nixops 1.6 release.

The user will not get the warning that these have been renamed but
this change is mentioned in the release notes.

Fixes #34253.

(cherry picked from commit 70c6f65)

(cherry picked from commit a415963ef7464d7ce8f9c73684728625e83d8d63)

(cherry picked from commit 0bee079)

also, rename to svn-all-fast-export, but keep an alias to the old name

(cherry picked from commit 594130f)