update test to handle change easy_install

Either the new pip or the new setuptools changes the
virtualenv so easy-install.pth is no longer present
when the test runs, so look for easy_install itself.

Change-Id: I9c3da40725d7efd6f7377df27d4666578beeb41c

Author: dhellmann

tests/test_ls.sh

@@ -28,9 +28,7 @@ test_get_site_packages_dir () {
 test_lssitepackages () {
     mkvirtualenv "lssitepackagestest" >/dev/null 2>&1
     contents="$(lssitepackages)"    
-    actual=$(echo $contents | grep easy-install.pth)
-    expected=$(echo $contents)
-    assertSame "$expected" "$actual"
+    assertTrue "did not find easy_install in site-packages" "echo $contents | grep -q easy_install"
     deactivate
 }