lxc: fixup 'download' template use

We have a new dependency on 'mountpoint' which is now called in the
download template script. We also hit an upstream bug due to improper
use of 'mktemp', so we apply a patch to fix this and sent the fix
upstream as well.

Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

recipes-containers/lxc/files/templates-actually-create-DOWNLOAD_TEMP-directory.patch

@@ -0,0 +1,39 @@
+From 1d83b86a9bf017257c068c662ec3bf52ec0cfe90 Mon Sep 17 00:00:00 2001
+From: Mark Asselstine <mark.asselstine@windriver.com>
+Date: Thu, 31 May 2018 16:21:45 -0400
+Subject: [PATCH] templates: actually create DOWNLOAD_TEMP directory
+
+The way 'mktemp' is currently used you will get a temp directory in
+$TMPDIR or '/tmp' and DOWNLOAD_TEMP will not be pointing to an actual
+directory. This will result in the wget operations failing and the
+container will fail to create:
+
+    ERROR: Failed to download http://....
+
+Instead we want to use the '-p' option for mktemp to set the base path
+and this will ensure that the temp directory is created in the correct
+location and DOWNLOAD_TEMP will be consistent with this location.
+
+Upstream-Status: Pending
+
+Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
+---
+ templates/lxc-download.in | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/templates/lxc-download.in b/templates/lxc-download.in
+index f875183..5f1138c 100644
+--- a/templates/lxc-download.in
++++ b/templates/lxc-download.in
+@@ -320,7 +320,7 @@ fi
+ if ! command -V mktemp >/dev/null 2>&1; then
+   DOWNLOAD_TEMP="${DOWNLOAD_TEMP}/tmp/lxc-download.$$"
+ else
+-  DOWNLOAD_TEMP="${DOWNLOAD_TEMP}$(mktemp -d)"
++  DOWNLOAD_TEMP="$(mktemp -p ${DOWNLOAD_TEMP} -d)"
+ fi
+ 
+ # Simply list images
+-- 
+2.7.4
+

recipes-containers/lxc/lxc_3.0.0.bb

@@ -24,6 +24,7 @@ RDEPENDS_${PN} = " \
 		libidn \
 		gnutls \
 		nettle \
+		util-linux-mountpoint \
 "
 
 RDEPENDS_${PN}_append_libc-glibc = " glibc-utils"
@@ -40,6 +41,7 @@ SRC_URI = "http://linuxcontainers.org/downloads/${BPN}-${PV}.tar.gz \
 	file://lxc-fix-B-S.patch \
 	file://lxc-doc-upgrade-to-use-docbook-3.1-DTD.patch \
 	file://logs-optionally-use-base-filenames-to-report-src-fil.patch \
+	file://templates-actually-create-DOWNLOAD_TEMP-directory.patch \
 	file://dnsmasq.conf \
 	file://lxc-net \
 	"