Migrate to included systemd unit

stretch/debian/control

@@ -12,6 +12,7 @@ Build-Depends: bash-completion,
                cmake (>= 3.2.2) | pkg-config,
                debhelper (>= 9),
                dh-systemd (>= 1.5),
+               libsystemd-dev,
                flex,
                g++ (>= 1.96),
                libboost-dev,

stretch/debian/icinga2-common.icinga2.service

-[Unit]
-Description=Icinga host/service/network monitoring system
-After=postgresql.service mariadb.service carbon-cache.service mysql.service syslog.target network.target
-
-[Service]
-Type=simple
-UMask=0007
-EnvironmentFile=/usr/lib/icinga2/icinga2
-EnvironmentFile=/etc/default/icinga2
-ExecStartPre=/usr/lib/icinga2/prepare-dirs /usr/lib/icinga2/icinga2
-ExecStart=/usr/sbin/icinga2 daemon -e ${ICINGA2_ERROR_LOG}
-ExecReload=/usr/lib/icinga2/safe-reload /usr/lib/icinga2/icinga2
-PIDFile=/run/icinga2/icinga2.pid
-
-[Install]
-WantedBy=multi-user.target
-

stretch/debian/icinga2-common.install

@@ -4,6 +4,6 @@ debian/tmp/etc/icinga2
 debian/tmp/etc/logrotate.d
 tools/syntax/nano/icinga2.nanorc usr/share/nano
 usr/share/icinga2
-etc/sysconfig/icinga2 usr/lib/icinga2
 usr/lib/icinga2/prepare-dirs
 usr/lib/icinga2/safe-reload
+usr/lib/systemd/system/icinga2.service lib/systemd/system

stretch/debian/rules

@@ -44,6 +44,7 @@ override_dh_auto_configure:
 		-- \
 		-DCMAKE_INSTALL_LOCALSTATEDIR=/var \
 		-DCMAKE_INSTALL_SYSCONFDIR=/etc \
+		-DICINGA2_SYSCONFIGFILE=/etc/default/icinga2 \
 		-DICINGA2_RUNDIR=/run \
 		-DICINGA2_USER=nagios \
 		-DICINGA2_GROUP=nagios \
@@ -51,6 +52,7 @@ override_dh_auto_configure:
 		-DICINGA2_GIT_VERSION_INFO=false \
 		-DICINGA2_PLUGINDIR=/usr/lib/nagios/plugins \
 		-DICINGA2_WITH_STUDIO=true \
+		-DUSE_SYSTEMD=ON \
 		$(UNITY_BUILD) \
 		$(LTO_BUILD)