Bug 1603804. Move third_party/python/lldbutils to python/lldbutils. r=ahal

This undoes the mistaken move of this directory into third_party that happened
as part of bug 1346025.

The .flake8 changes are required because lldbutils used to be excluded from
linting by virtue of being inside third_party, but would otherwise be subject
to it after this move. Fixing the existing lint errors will happen in:

  - https://bugzilla.mozilla.org/show_bug.cgi?id=1605144
  - https://bugzilla.mozilla.org/show_bug.cgi?id=1605145

Differential Revision: https://phabricator.services.mozilla.com/D57141

--HG--
rename : third_party/python/lldbutils/README.txt => python/lldbutils/README.txt
rename : third_party/python/lldbutils/lldbutils/__init__.py => python/lldbutils/lldbutils/__init__.py
rename : third_party/python/lldbutils/lldbutils/content.py => python/lldbutils/lldbutils/content.py
rename : third_party/python/lldbutils/lldbutils/general.py => python/lldbutils/lldbutils/general.py
rename : third_party/python/lldbutils/lldbutils/gfx.py => python/lldbutils/lldbutils/gfx.py
rename : third_party/python/lldbutils/lldbutils/layout.py => python/lldbutils/lldbutils/layout.py
rename : third_party/python/lldbutils/lldbutils/utils.py => python/lldbutils/lldbutils/utils.py
extra : moz-landing-system : lando

.flake8

@@ -24,6 +24,7 @@ exclude =
     netwerk/protocol/http/make_incoming_tables.py,
     python/devtools/migrate-l10n/migrate/main.py,
     python/l10n/fluent_migrations,
+    python/lldbutils,
     python/mozbuild/dumbmake,
     security/manager/ssl/tests/unit,
     servo/components/style,

.lldbinit

@@ -10,7 +10,7 @@
 # or the dist/bin directory.  (.lldbinit files in the objdir and dist/bin set
 # topsrcdir appropriately.)
 script topsrcdir = topsrcdir if "topsrcdir" in locals() else os.getcwd()
-script sys.path.append(os.path.join(topsrcdir, "third_party/python/lldbutils"))
+script sys.path.append(os.path.join(topsrcdir, "python/lldbutils"))
 script import lldbutils
 script lldbutils.init()