Optionals.toStream -> RichStream.from

Summary: As suggested in D15194495, split into separate diffs.

Reviewed By: styurin

fbshipit-source-id: 9376858981

Fix one cause of zombie buckd processes

Summary:
We've gotten reports of multiple `buckd` processes being created for
a single root, and `buck kill` doesn't make the extras go away. I've
been investigating the prevalence of this problem, and along the way
I found one cause of it. The comment in the code says the rest.

Reviewed By: styurin

fbshipit-source-id: 4a13247d7d

Rename LocalCache to LocalCacheStorage

Summary: Renamed LocalCache to LocalCacheStorage.

Reviewed By: bobyangyf

fbshipit-source-id: 677265dec0

Remove unused properties from build.xml.

Reviewed By: styurin

fbshipit-source-id: 961d9a2478

Remove redundant throws.

Summary: `IOException` olready covers Json exceptions.

Reviewed By: philipjameson

fbshipit-source-id: a09f7a8a92

Try to use c:\Python2.7\python.exe before defaulting to python.exe on…

… path

Summary:
Attempt to use python2 binary directly before falling back to 'python.exe' on the path

Fixes 2011

Reviewed By: styurin

fbshipit-source-id: 244e66f023

Do not compute compileTimeClasspathFullDeps twice.

Summary: This method is actually marked as Value.Lazy, so it's not a full recomputation, but still.

Reviewed By: bobyangyf

fbshipit-source-id: d8221b0100

TOC: Move command reference above build rules reference

Summary: Move the Buck command reference above the build rules so that it is "above the fold" and more discoverable for our users.

Reviewed By: ttsugriy

fbshipit-source-id: aca25bbfbd

Add V2 signing to local fb4a

Summary:
Support V2 signing on local debug version of fb4a.
- Compile and include apksigner.jar from (Google's Android Open Source](https://fburl.com/0c6z5fof) to buck aosp respository
- Add an ApkSignerStep to ApkBuilder to support v1/v2/v3 signing on APK, using apksigner.jar

Reviewed By: styurin

fbshipit-source-id: 2bc1b7dd37

Fix DirectoryCleaner sometimes deleting buck-out/log/ subdirectories …

…for the current run

Summary: After it decides it needs to delete stuff, `DirectoryCleaner` doesn't respect `LogFileHandler`'s minimum number of logs to keep setting. When log subdirectories become relatively large, e.g. 10MB when outputting verbose rulekey logs, even the log subdirectories for the current run can get deleted, leaving behind dangling `last_XXXcommand` symlinks. The fix is to consolidate the deletion check logic in one place.

Reviewed By: styurin

fbshipit-source-id: 8660a1b5f2