By installing vifib_erp5, it should resolve all depencies to bootstrap one
SlapOS Master site.

Added destroyed state to server response and tests to check if one failing partition will doom others

Conflicts:
	slapos/grid/slapgrid.py
	slapos/tests/slapgrid.py

Add periodicity and factored tests

Fix 77bc6c75

Also use this code in test.

It will be used during allocation.

Allow to add new networks. Allow to associate Computer into networks. Allow to
see list of Computers in network.

Each iteration (each partition) of main CP loop has sanity checks and makes sure nothing raises outside.