phoshor-rsyslog-config: wrap utils::restart

Provide a virtual wrapper around utils::restart in class Server. This
allows mocking in tests.

Change-Id: I79a229eaaaa17860959b8025eb8c152362738acf
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/phosphor-rsyslog-config/server-conf.cpp b/phosphor-rsyslog-config/server-conf.cpp
index 0b5bc62..4bf8c79 100644
--- a/phosphor-rsyslog-config/server-conf.cpp
+++ b/phosphor-rsyslog-config/server-conf.cpp
@@ -105,7 +105,7 @@
         stream << "#*.* @@remote-host:port";
     }
 
-    utils::restart();
+    restart();
 }
 
 bool Server::addressValid(const std::string& address)
@@ -150,5 +150,10 @@
     }
 }
 
+void Server::restart()
+{
+    utils::restart();
+}
+
 } // namespace rsyslog_config
 } // namespace phosphor
diff --git a/phosphor-rsyslog-config/server-conf.hpp b/phosphor-rsyslog-config/server-conf.hpp
index 0f67f30..edab113 100644
--- a/phosphor-rsyslog-config/server-conf.hpp
+++ b/phosphor-rsyslog-config/server-conf.hpp
@@ -69,6 +69,10 @@
          */
         virtual uint16_t port(uint16_t value) override;
 
+        /** @brief Restart rsyslog's systemd unit
+         */
+        virtual void restart();
+
     private:
         /** @brief Update remote server address and port in
          *         rsyslog config file.