Set COLUMNS for tests to handle different terminals

tox.ini

@@ -24,9 +24,13 @@ sitepackages = true
 # from source
 setenv =
     RPM_PY_INSTALL_BIN=true
+    COLUMNS=80
 # If rpm's python bindings are missing, don't continue
 # Also, because coverage might be installed system-wide and it serves as our
 # entry point, let's make sure it's installed in the virtualenv.
+#
+# COLUMNS setting is propagated to optparse and ensures that formatted text
+# is same in the CLI output on all platforms
 commands_pre =
     {envbindir}/python -c "import rpm"
     pip install -I coverage