add sqlite-devel to devenv to enable sqlite3 ruby gem

Avoid error:

```
Installing sqlite3 (1.3.6)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /usr/bin/ruby extconf.rb
checking for sqlite3.h... no
sqlite3.h is missing. Try 'port install sqlite3 +universal'
or 'yum install sqlite-devel' and check your shared library search path (the
location where your sqlite3 shared library is located).
*** extconf.rb failed ***
```

Resolves jumanjiman/wormhole#27
ensure devenv passes all open-scap tests in common profile

Provide an xccdf SCAP tailoring file to adjust the common profile:
- don't check ntpd (inside container)
- don't check password defaults (we don't allow password auth at all)
- don't check prelink (we don't install, and upstream assumes we do)
- allow 15 minute idle timeout (upstream defaults to 5 minutes)

Add new functional tests as shown in the diff for README.