Add a command-line option to specify restricted allocation
Add a command-line option to specify restricted allocation

While allocation restricted to a set of nodes will mainly
be passed as part of a hail request, it is useful to have that
option also available on the command line, e.g., for testing.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

yiannist/ganeti,andir/ganeti,bitemyapp/ganeti,mbakke/ganeti,mbakke/ganeti,leshchevds/ganeti,grnet/snf-ganeti,yiannist/ganeti,ganeti/ganeti,bitemyapp/ganeti,ganeti/ganeti,grnet/snf-ganeti,andir/ganeti,ganeti/ganeti,leshchevds/ganeti,andir/ganeti,leshchevds/ganeti,yiannist/ganeti,onponomarev/ganeti,mbakke/ganeti,onponomarev/ganeti