eopkg: bootstrap Solus without /var/ hacks

[ikeydoherty]

Currently we're unable to get Solus fully bootstrapped without completing the /run -> /var dance.

This is due to multiple problems:

• eopkg attempts to use /var/lock, not /run/lock, and creates a broken chroot immediately
• dbus is configured (everywhere) to use /var/run/dbus as the home location, should only be /run. systemd recreates this tree on startup, so by using this path we're insulated against /var failures.