Use DIB_INIT_SYSTEM for systemd checks.

Minor additions to b01c73a where we switched over to use
DIB_INIT_SYSTEM instead of a systemd file check.

This commit updates a couple remaining Fedora distro checks to use
to use the dib init system check instead.

Change-Id: Ifc1ed73b23827005cbdba3531e113491f734c9af
Merge "Use DIB_INIT_SYSTEM for systemd checks."