net/intel-em: use upcoming rc.loader for loader.conf contents

We can also automate by checking for existence of src/etc/rc.loader.d
and push to post-install and post-deinstall (yes, post, file must
be removed to generate the correct loader.conf), but that's a minor
thing for later.  :)

net/intel-em/+POST_DEINSTALL

@@ -0,0 +1 @@
+/usr/local/etc/rc.loader

net/intel-em/+POST_INSTALL

@@ -1,6 +1 @@
-echo "Updating /boot/loader.conf"
-touch /boot/loader.conf
-cp /boot/loader.conf /boot/loader.conf.bak
-(grep -v if_em_updated_load /boot/loader.conf.bak; \
-    echo 'if_em_updated_load="YES"') > /boot/loader.conf
-rm -f /boot/loader.conf.bak
+/usr/local/etc/rc.loader

net/intel-em/+PRE_DEINSTALL

@@ -1,5 +0,0 @@
-echo "Updating /boot/loader.conf"
-touch /boot/loader.conf
-cp /boot/loader.conf /boot/loader.conf.bak
-(grep -v if_em_updated_load /boot/loader.conf.bak) > /boot/loader.conf
-rm -f /boot/loader.conf.bak

net/intel-em/Makefile

@@ -1,5 +1,5 @@
 PLUGIN_NAME=		intel-em
-PLUGIN_VERSION=		1.1
+PLUGIN_VERSION=		1.2
 PLUGIN_COMMENT=		Intel Gigabit Base Driver
 PLUGIN_DEPENDS=		intel-em-kmod
 PLUGIN_MAINTAINER=	ad@opnsense.org

net/intel-em/src/etc/rc.loader.d/50-intel-em

@@ -0,0 +1 @@
+if_em_updated_load="YES"