main/vlan: load kernel module 8021q if needed

fixes #1212
(cherry picked from commit 98832700)

main/vlan/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=vlan
 pkgver=1.9
-pkgrel=0
+pkgrel=1
 pkgdesc="Scripts for configuring VLAN network interfaces"
 url="http://wiki.alpinelinux.org/wiki/Vlan"
 arch="noarch"
@@ -44,4 +44,4 @@ package() {
 md5sums="3683be24d1fc1d8565e945c349c41571  mvlan.post-down
 5b6232674e83b0dbfc24af523dd5ec03  mvlan.pre-up
 cebaa97c933ed0f4cafd92f864ab4bc8  vlan.post-down
-c9acef8c17d8af19590767f57eb11b6b  vlan.pre-up"
+53378ae34ad2f475901bb43049a6c146  vlan.pre-up"

main/vlan/vlan.pre-up

@@ -4,6 +4,9 @@ do_vlan_config() {
     local id="$2"
     local newname="$3"
     local nametype="$4"
+    if ! [ -d /proc/net/vlan ]; then
+        modprobe 8021q
+    fi
     vconfig set_name_type ${nametype}
     vconfig add ${device} ${id}
 }