Handle huge /bin directories in libdb2 test

Handle huge /bin directories in libdb2 test

The test suite for libdb2 uses /bin as a source of filenames and
contents for insertion into databases.  Fedora 17 (and possibly other
OSes) have /bin symlinked to /usr/bin, which can vastly increase the
number of files found, exceeding some limits of the test databases.
Truncate this list of files at 100 to prevent this problem.

(cherry picked from commit 18a378eb43a7a5a5e14a7e6c3b6504fe32804781)

ticket: 7201
version_fixed: 1.10.3
status: resolved