server runner will shut down forcefully

this is needed to free network resources before the daemon exits
(see grpc::ServerInterface::Shutdown with deadline parameter)

Signed-off-by: Mikhail Boldyrev <miboldyrev@gmail.com>

irohad/main/server_runner.cpp

@@ -5,6 +5,8 @@
 
 #include "main/server_runner.hpp"
 
+#include <chrono>
+
 #include <grpc/impl/codegen/grpc_types.h>
 #include <boost/format.hpp>
 #include "logger/logger.hpp"
@@ -20,6 +22,10 @@ ServerRunner::ServerRunner(const std::string &address,
       reuse_(reuse),
       tls_keypair_(tls_keypair) {}
 
+ServerRunner::~ServerRunner() {
+  shutdown(std::chrono::system_clock::now());
+}
+
 ServerRunner &ServerRunner::append(std::shared_ptr<grpc::Service> service) {
   services_.push_back(service);
   return *this;

irohad/main/server_runner.hpp

@@ -30,6 +30,8 @@ class ServerRunner {
       bool reuse = true,
       const boost::optional<TlsKeypair> &tls_keypair = boost::none);
 
+  ~ServerRunner();
+
   /**
    * Adds a new grpc service to be run.
    * @param service - service to append.