php-fpm: Add support for systemd

Adds suport for systemd, creates a service for php-fpm and installs it if required

Signed-off-by: Alejandro Hernandez <alejandro.hernandez@linux.intel.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-devtools/php/php/php-fpm.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=PHP-FPM
+After=network.target
+[Service]
+Type=forking
+PIDFile=@LOCALSTATEDIR@/run/php-fpm.pid
+ExecStart=@SYSCONFDIR@/init.d/php-fpm start
+ExecStop=@SYSCONFDIR@/init.d/php-fpm stop
+[Install]
+WantedBy=multi-user.target