Bug#726714: adt-run fails when fakeroot not installed in testbed and build is needed

[Jean-Baptiste Lallement]

Package: autopkgtest
Version: 2.3.7
Severity: normal
Tags: patch

Build phase fails if fakeroot is not installed in the testbed.

TEST CASE:
1. Create an lxc-container with the command
   $ sudo lxc-create -n saucy-amd64 -t ubuntu-cloud -- -r saucy -a amd64

2. Download a dsc for a package and run a test with:
   $ adt-run -d ../autopkgtest_2.3.7.dsc --- adt-virt-lxc --ephemeral 
saucy-amd64

ACTUAL RESULT:
If fails with
+ TMPDIR=/tmp/adt-downtmp/dsc0-build/tmpdir
+ rm -rf -- /tmp/adt-downtmp/dsc0-build/tmpdir
+ export TMPDIR
+ su ubuntu -c mkdir -m 1777 -- "$TMPDIR"
+ cd /tmp/adt-downtmp/dsc0-build/autopkgtest-2.3.7/.
+ su ubuntu -c fakeroot debian/rules binary
bash: fakeroot: command not found
blame: arg:../autopkgtest_2.3.7.dsc dsc:autopkgtest
badpkg: rules binary failed with exit code 127
adt-run: erroneous package: rules binary failed with exit code 127

Ubuntu Bug: 
https://bugs.launchpad.net/ubuntu/+source/autopkgtest/+bug/1241456

Proposition of patch attached.

Cheers,

Jean-Baptiste.
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