Bug#783832: debsources: reenable the file count assertion that fails on travis builds

[Stefano Zacchiroli <zack@debian.org>]

Package: qa.debian.org
Severity: minor
User: qa.debian.org@packages.debian.org
Usertags: debsources

See commit:
https://anonscm.debian.org/cgit/qa/debsources.git/commit/?id=fdcb6a97fd490f53c3ae1bea1785ac35a12a0e54

The assertion disabled in that commit should be reenabled. Before doing that,
though, we should figure out why it fails in the travis CI environment.

Cheers.

-- System Information:
Debian Release: 8.0
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=it_IT.utf8, LC_CTYPE=it_IT.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)