deb packages support: switch from /var/dpkg to /var/lib/dpkg

[YOCTO #1086]

The pach was backported from OE:
http://git.openembedded.net/cgit.cgi/openembedded/commit/?id=41e0fbf792037f249d1b8d283b3de81718887c9f

(From OE-Core rev: d1e6f49a6473df3c626100ba01b27485f735c33b)

Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/dpkg/run-postinsts/run-postinsts

@@ -5,7 +5,7 @@
 # Author: Richard Purdie <rpurdie@openedhand.com>
 #
 
-PKGSYSTEM=/var/dpkg
+PKGSYSTEM=/var/lib/dpkg
 
 if [ ! -e $PKGSYSTEM/status ]; then
   if [ -e /usr/lib/opkg/status ]; then

meta/recipes-devtools/dpkg/run-postinsts/run-postinsts.awk

@@ -9,7 +9,7 @@
 BEGIN {
   rc=system("test -d /usr/dpkg/info/")
   if (rc==0)
-    pkgdir="/var/dpkg/info"
+    pkgdir="/var/lib/dpkg/info"
   else
     pkgdir="/usr/lib/opkg/info"
   package=""

meta/recipes-devtools/dpkg/run-postinsts_1.0.bb

@@ -1,6 +1,6 @@
 DESCRIPTION = "Run postinstall scripts on device using awk"
 SECTION = "devel"
-PR = "r6"
+PR = "r7"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58 \
                     file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"