Log considered nodes in allocator run
Log considered nodes in allocator run

When opportunistically allocating nodes for an instance to be created,
not all nodes can be considered for instance placement. Support debugging
which nodes were considered.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>

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