When Fabric version is 2.5, use V2_5 capabilities

[dzikowski]

When Fabric version is 2.5, use V2_5 capabilities

Requires setting application capability to V2_5 in channel configuration. Requires adding object similar to:

interface CapabilitiesV2 {
  application: "V2_0";
  channel: "V2_0";
  orderer: "V2_0";
  isV2: true;
}

Then use it by default for Fabric 2.5 and higher