make iso fails: some packages fail to install in Ubuntu chroot

[Alexei Sheplyakov]

make iso fails when creating Ubuntu chroot (used for image based provisioning) with the following error:

Selecting previously unselected package linux-image-3.13.0-40-generic.
Preparing to unpack .../linux-image-3.13.0-40-generic_3.13.0-40.69_amd64.deb ...
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
grep: /proc/cpuinfo: No such file or directory
This kernel does not support a non-PAE CPU.
dpkg: error processing archive /tmp/mirror/ubuntu/pool/main/linux-image-3.13.0-40-generic_3.13.0-40.69_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1

The root cause is that /proc is not mounted in the staging chroot, hence the configuration scripts which need /proc fail.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/142409

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/142409
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=2c7395dae943e3098660653ecf7c0fb1dfb40d07
Submitter: Jenkins
Branch: master

commit 2c7395dae943e3098660653ecf7c0fb1dfb40d07
Author: Alexei Sheplyakov <email address hidden>
Date: Wed Dec 17 11:47:54 2014 +0300

    image/ubuntu: fix packages installation failures due to missing /proc

    The configuration scripts of some packages (in particular linux-image)
    fail if /proc is not mounted. Mount /proc in the chroot before installing
    packages (and umount it afterwards).

    Related-bug: #1383641
    Closes-bug: #1403435
    blueprint support-ubuntu-trusty
    Change-Id: I6846b7d7107260125291efee27f6205b8e48969f