Improve slice logging by adding more details

[ibaldin]

• Add VM sizes into the log

[ibaldin]

Addressed in #194

Here is an example of vmdetails:

with  compute vms:3,cores:20,p4s:0; sites RENC,UKY; components NVME:1,SharedNIC:1,SmartNIC:2,GPU:1; services L2STS:0; vmdetails C4/R0/D10:1,C8/R2/D0:2

Note that allocated_capacities is preferred to capacities on the node object so most/all of the time you will see what was allocated, not what was requested.