devserver: make artifact names globs by default

What this means is that, by default, we'll be using a glob expression
(i.e. a path that may contain shell-style wildcards) instead of a regex
to identify artifacts. We are still allowing artifacts to be defined by
a regex, as this is useful for some purposes such as disallowing certain
file name patterns; this semantics, however, needs to be specifically
selected via a flag.

Some additional changes included:

* Eliminate enforcing a single file in gsutil_util.GetGSNamesWithWait();
  this is already done in the caller function and there's no need to
  complicate the otherwise generic logic in this module.

* Have DeltaPayloadsArtifact override various name filtering parameters
  internally; letting the user define these may cause inconsistencies
  (especially given the glob vs regex semantics), makes it less robust
  and is not needed in practice.

* Fixes passing of dictionary args (as opposed to list args) to artifact
  objects via artifact factory.

* Fixes a great many gpylint errors/warnings.

BUG=chromium:280220
TEST=Unit tests
TEST=gpylint

Change-Id: I9ea59b7f8962a71f7b387b99b0577932e753c2eb
Reviewed-on: https://chromium-review.googlesource.com/167434
Reviewed-by: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Commit-Queue: Gilad Arnold <garnold@chromium.org>
diff --git a/build_artifact_unittest.py b/build_artifact_unittest.py
index fddfccb..82011d0 100755
--- a/build_artifact_unittest.py
+++ b/build_artifact_unittest.py
@@ -103,7 +103,7 @@
   def testDeltaPayloadsArtifact(self):
     """Downloads delta paylaods from test bucket."""
     artifact = build_artifact.DeltaPayloadsArtifact(
-        self.work_dir, _TEST_GOLO_FOR_DELTAS, '.*_delta_.*', _DELTA_VERSION)
+        self.work_dir, _TEST_GOLO_FOR_DELTAS, 'DONTCARE', _DELTA_VERSION)
     artifact.Process(False)
     nton_dir = os.path.join(self.work_dir, 'au', '%s_nton' % _DELTA_VERSION)
     mton_dir = os.path.join(self.work_dir, 'au', '%s_mton' % _DELTA_VERSION)
@@ -114,7 +114,7 @@
     """Downloads and stages a zip file and extracts a test image."""
     artifact = build_artifact.ZipfileBuildArtifact(
         self.work_dir, _TEST_GOLO_ARCHIVE, build_artifact.IMAGE_FILE,
-        _VERSION, ['chromiumos_test_image.bin'])
+        _VERSION, files_to_extract=['chromiumos_test_image.bin'])
     artifact.Process(False)
     self.assertTrue(os.path.exists(os.path.join(
         self.work_dir, 'chromiumos_test_image.bin')))
@@ -123,7 +123,7 @@
     """Downloads and stages a zip file while excluding all large files."""
     artifact = build_artifact.ZipfileBuildArtifact(
         self.work_dir, _TEST_GOLO_ARCHIVE, build_artifact.IMAGE_FILE,
-        _VERSION, None, ['*.bin'])
+        _VERSION, exclude=['*.bin'])
     artifact.Process(False)
     self.assertFalse(os.path.exists(os.path.join(
         self.work_dir, 'chromiumos_test_image.bin')))