Followup fix for .profile.extra

Allow to source .profile.extra such that it is possible to
read and act on e.g cmdline parameters. This is related to
bsc#1218095

dracut/modules.d/99kiwi-lib/kiwi-dialog-lib.sh

@@ -78,7 +78,7 @@ function _setup_interactive_service {
         echo "Wants=systemd-vconsole-setup.service"
         echo "Conflicts=emergency.service emergency.target"
         echo "[Service]"
-        echo "EnvironmentFile=/.profile.extra"
+        echo "EnvironmentFile=/dialog_profile"
         echo "Environment=HOME=/"
         echo "Environment=DRACUT_SYSTEMD=1"
         echo "Environment=NEWROOT=/sysroot"

dracut/modules.d/99kiwi-lib/kiwi-lib.sh

@@ -185,10 +185,10 @@ function initialize {
 
     import_file ${profile}
 
-    test -f ${profile_extra} || \
-        cat >${profile_extra}</dev/null
+    test -f ${profile_extra} && source ${profile_extra}
 
-    import_file ${profile_extra}
+    # Used in the systemd dialog unit
+    env >/dialog_profile
 
     # Handle overwrites
     kiwi_oem_installdevice=$(getarg rd.kiwi.oem.installdevice=)

dracut/modules.d/99kiwi-lib/module-setup.sh

@@ -15,7 +15,7 @@ depends() {
 install() {
     declare moddir=${moddir}
     inst_multiple \
-        blkid blockdev dd mkdir rmdir \
+        blkid blockdev dd mkdir rmdir env \
         grep cut tail head tr bc true false mountpoint \
         basename sfdisk sgdisk mkswap readlink lsblk \
         btrfs xfs_growfs resize2fs \