Provide --target-resources option
Provide --target-resources option

Add a new option, to be used by hsqueeze, to specify the
target free resources on each node. It is given as a multiple
of the standard allocation, as specified in the instance policy.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Michele Tartara <05f7077a2c6cbbdc4af4ba42e3ef89a0df846179@google.com>

ganeti/ganeti,leshchevds/ganeti,onponomarev/ganeti,bitemyapp/ganeti,andir/ganeti,yiannist/ganeti,dimara/ganeti,onponomarev/ganeti,apyrgio/ganeti,apyrgio/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,andir/ganeti,mbakke/ganeti,dimara/ganeti,grnet/snf-ganeti,leshchevds/ganeti,andir/ganeti,mbakke/ganeti,grnet/snf-ganeti,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,bitemyapp/ganeti,yiannist/ganeti,mbakke/ganeti,leshchevds/ganeti