rpm spec file, extra/vm: Install curl, expect, and ssh

These are all required by the `stbt power` utility added in e685e554.

The order of packages in both these files is:

* Packages required by the core stbt utilities (stbt run, stbt record).
* Packages required by other installed stbt utilities (stbt power).
* (extra/vm only) Packages required by non-installed
  utilities (extra/runner).
* (extra/vm only) Packages required to run the self-tests.
* (extra/vm only) Other convenient packages.