[PATCH] debian: add less as a build dependency

[Rodrigo Damazio Bovendorp]

# HG changeset patch
# User Rodrigo Damazio Bovendorp <rdamazio at google.com>
# Date 1495852400 25200
#      Fri May 26 19:33:20 2017 -0700
# Node ID eb70f0115b8c880218a45fc9e1f59eeb38b2f219
# Parent  b647b923486f38d83b92089eafa9faafaa79785d
debian: add less as a build dependency

For builds that run on hermetic environments, it's possible that the "less"
package is not installed by default, yet it's needed for tests to pass after
revision bf5e13e38390 (which sets less as the fallback pager).

diff --git a/contrib/debian/control b/contrib/debian/control
--- a/contrib/debian/control
+++ b/contrib/debian/control
@@ -5,6 +5,7 @@
 Build-Depends:
  debhelper (>= 9),
  dh-python,
+ less,
  netbase,
  python-all,
  python-all-dev,