code: function getClusterVersion(request, mCb) {
  			delete request.project;
  			v1Container().projects.zones.getServerconfig(request, function (err, response) {
  				if (err) {
  					return mCb(err);
  				}
  				let version;
  				if (response && response.validMasterVersions && Array.isArray(response.validMasterVersions)
  					&& response.validMasterVersions.length > 0) {
  					response.validMasterVersions.forEach(function (oneVersion) {
  						if (oneVersion.substring(0, 3) === "1.7") {
  							version = oneVersion;
  							options.soajs.log.debug("Initial Cluster version set to :", version);
  						}
  					});
  					
  				} else if (response && response.defaultClusterVersion && !version) {
  					version = response.defaultClusterVersion;
  					options.soajs.log.debug("Initial Cluster version set to default version :", version);
  				} else {
  					return mCb({"code": 410, "msg": "Invalid or no kubernetes cluster version found!"})
  				}
  				return mCb(null, version);
  			});
  		}
docs: method used to get cluster version
  @returns {*}