Cleanup remote console access

openstack-config/ch_consoleconfigure.xml is unused, the sections
referenced in it are included already in another place in the manual.

Also, use compute-spice-console.xml instead of the duplicated content
in common/section_compute-configure-console.xml.

Rename compute-spice-console.xml to follow the vnc example.

Change-Id: Ib5e23151a7905f11886bd9eeaf675aa0cf278372
Merge "Cleanup remote console access"