Add ability to exclude files matching glob patterns with --ignore-glob

This adds the `--ignore-glob` option to allow Unix-style wildcards so
that `--ignore-glob=integration*` excludes all tests that reside in
files starting with `integration`.

Fixes: #3711

src/_pytest/main.py

@@ -4,6 +4,7 @@ from __future__ import division
 from __future__ import print_function
 
 import contextlib
+import fnmatch
 import functools
 import os
 import pkgutil
@@ -117,6 +118,12 @@ def pytest_addoption(parser):
         metavar="path",
         help="ignore path during collection (multi-allowed).",
     )
+    group.addoption(
+        "--ignore-glob",
+        action="append",
+        metavar="path",
+        help="ignore path pattern during collection (multi-allowed).",
+    )
     group.addoption(
         "--deselect",
         action="append",
@@ -296,6 +303,17 @@ def pytest_ignore_collect(path, config):
     if py.path.local(path) in ignore_paths:
         return True
 
+    ignore_globs = []
+    excludeglobopt = config.getoption("ignore_glob")
+    if excludeglobopt:
+        ignore_globs.extend([py.path.local(x) for x in excludeglobopt])
+
+    if any(
+        fnmatch.fnmatch(six.text_type(path), six.text_type(glob))
+        for glob in ignore_globs
+    ):
+        return True
+
     allow_in_venv = config.getoption("collect_in_virtualenv")
     if not allow_in_venv and _in_venv(path):
         return True