Resolve "(OPT) SBI for QKD Nodes", "(OPT) QKD Network Topology" and "(OPT) Path Computation for QKD Networks"

Closes #129 (closed), #130 (closed), #131 (closed)

proto/context.proto

@@ -214,6 +214,7 @@ enum DeviceDriverEnum {
   DEVICEDRIVER_OPTICAL_TFS = 9;
   DEVICEDRIVER_IETF_ACTN = 10;
   DEVICEDRIVER_OC = 11;
+  DEVICEDRIVER_QKD = 12;
 }
 
 enum DeviceOperationalStatusEnum {
@@ -300,6 +301,7 @@ enum ServiceTypeEnum {
   SERVICETYPE_TE = 4;
   SERVICETYPE_E2E = 5;
   SERVICETYPE_OPTICAL_CONNECTIVITY = 6;
+  SERVICETYPE_QKD = 7;
 }
 
 enum ServiceStatusEnum {