[lldb][test] Remove LLDB_TEST_USE_VENDOR_PACKAGES (#89260)

The `LLDB_TEST_USE_VENDOR_PACKAGES` has defaulted to `Off` for a while.
Either installing `pexpect` or skipping those tests with
`-DLLDB_

[lldb][test] Remove LLDB_TEST_USE_VENDOR_PACKAGES (#89260)

The `LLDB_TEST_USE_VENDOR_PACKAGES` has defaulted to `Off` for a while.
Either installing `pexpect` or skipping those tests with
`-DLLDB_TEST_USER_ARGS=--skip-category=pexpect` seems to be enough that
we can fully remove this option.

This patch removes the `LLDB_TEST_USE_VENDOR_PACKAGES` cmake
configuration as well as the associated code to add
`third_party/Python/module` to the python path. I'll do the actual
deletion of `third_party/Python/module` in a followup PR in the
(unlikely, I hope) event this commit needs to be reverted.

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[lldb][test][NFC] Add option to exclude third_party packages (#83191)

The goal here is to remove the third_party/Python/module tree, which
LLDB tests only use to `import pexpect`. This package is a

[lldb][test][NFC] Add option to exclude third_party packages (#83191)

The goal here is to remove the third_party/Python/module tree, which
LLDB tests only use to `import pexpect`. This package is available on
`pip`, and I believe should not be hard to obtain.

However, in case it isn't easily available, deleting the tree right now
could cause disruption. This introduces a
`LLDB_TEST_USE_VENDOR_PACKAGES` cmake param that can be enabled, and the
tests will continue loading that tree. By default, it is enabled,
meaning there's really no change here. A followup change will disable it
by default once all known build bots are updated to include this
package. When disabled, an eager cmake check runs that makes sure
`pexpect` is available before waiting for the test to fail in an obscure
way.

Later, this option will go away, and when it does, we can delete the
tree too. Ideally this is not disruptive, and we can remove it in a week
or two.

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[lldb] Format more Python files with black (#65979)

By running this from lldb/

$ black --exclude "third_party/|scripts/|utils/" ./

*** This commit represents a complete reformatting of the LLDB source code
*** to conform to clang-format’s LLVM style. This kind of mass change has
*** two obvious implications:

Firstly, merging t

*** This commit represents a complete reformatting of the LLDB source code
*** to conform to clang-format’s LLVM style. This kind of mass change has
*** two obvious implications:

Firstly, merging this particular commit into a downstream fork may be a huge
effort. Alternatively, it may be worth merging all changes up to this commit,
performing the same reformatting operation locally, and then discarding the
merge for this particular commit. The commands used to accomplish this
reformatting were as follows (with current working directory as the root of
the repository):

find . \( -iname "*.c" -or -iname "*.cpp" -or -iname "*.h" -or -iname "*.mm" \) -exec clang-format -i {} +
find . -iname "*.py" -exec autopep8 --in-place --aggressive --aggressive {} + ;

The version of clang-format used was 3.9.0, and autopep8 was 1.2.4.

Secondly, “blame” style tools will generally point to this commit instead of
a meaningful prior commit. There are alternatives available that will attempt
to look through this change and find the appropriate prior commit. YMMV.

llvm-svn: 280751

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Preparation for turning lldbsuite into a Python package.

The idea behind this patch is to expose the meat of
LLDB's Python infrastructure (test suite, scripts, etc)
as a single package. This makes

Preparation for turning lldbsuite into a Python package.

The idea behind this patch is to expose the meat of
LLDB's Python infrastructure (test suite, scripts, etc)
as a single package. This makes reusability and code
sharing among sub-packages easy.

Differential Revision: http://reviews.llvm.org/D14131

llvm-svn: 251460

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Rename `lldb_shared` to `use_lldb_suite`.

llvm-svn: 251444