[FIX] make sure every guest has a PRC
[FIX] make sure every guest has a PRC

Currently, a virtualisation guest only gets a PRC if it has at least one
test program. This means it won't report back to MCP without a test
program which is clearly wrong. Therefore, adding a PRC and the Tapper
client package is moved out of handle_guest_tests.

tapper/Tapper-MCP,tapper/Tapper-MCP