async getUShellServices(aServiceNames) {
			const mServices = {};
			for (const sServiceName of aServiceNames) {
				mServices[sServiceName] = await this.getUShellService(sServiceName);
			}
			return mServices;
		}
Gets the requested UShell Services from Ushell container, if container is available.
@param {array} aServiceNames - List of service names
@returns {Promise<object>} Resolves to an object with the requested ushell services