Template HPE Nimble/Alletra storage

[macan]

I have prepared new template for HPE Nimble/Alletra storage. It will be part of cacti versions 1.2.29/1.3.0.

Contains graphs (for the entire storage):
writes/reads total
write/read bytes total
Read cache hits total

Contains graphs (for each volume):
disk usage
snapshot usage
online/offline status and number of iscsi connections
reads/writes
read/write bytes
read latency
write latency