Restriction in ESME creation / updating time: routing-address, ton and npi must be the same in the cluster

[vetss]

When we are creation or updating ESME then we need to check that:
routing-adress,ton and npi must be same for all ESMEs in the cluster (when we are adding 2-nd, 3-d, etc ESME in the cluster).

Issue for a manual for it: RestComm/smscgateway#46

See also the issue: #3 (to do all together)

This is a copy of issue RestComm/smscgateway#48
from SMSC GW project.