* Move pulsar functions dependency version to root pom and remove duplicated license headers

This addresses some comments in pulsar functions PR #1314

* shade worker

* Fix broken master

* Upgrade the bookkeeper storage client dependency to the official bookkeeper version

This removes the temp dependency in `pulsar-functions-instance`

* set `protobuf2.version` in pulsar-common

* provide a shaded worker

* include worker dependency at broker

* Embeded function worker at broker

* rename 'function worker' to 'functions worker'

* add "--no-functions-worker" for pulsar-client-cpp tests

This removes the temp dependency in `pulsar-functions-instance`

This addresses some comments in pulsar functions PR #1314

- rename the V1 to V2
- change the way how the rest api was organized to allow it merged back to pulsar webservice and cli

* Add nightly-snapshot job

* Add a seed job

* change the email for testing

* Skip tests

* buildtools should inherit from apache profile

* update the release command

* Revert "change the email for testing"

This reverts commit 152f4c604229418c0f1de87d534b5790fcf81b21.

* remove "-Papache-release" so we don't require gpg keys for deploying to snapshot

* Refactored all unit tests to use new typed API with builders for configuration

* Did conversion in pulsar-client tool

* Refactoring typo fixes

- Remove function-composition

* Create ProcessBuilder at during start() so that start() can be called multiple times from Spawner

* Fix unittest

The `compile` scope in dependency plugin means : compile, provided, and system dependencies

Example:

```
(CONNECTING) />
(CONNECTED) /> ls pulsar/functions/test
test-namespace
(CONNECTED) /> ls pulsar/functions/test/test-namespace
function11
function12
function13
(CONNECTED) /> ls pulsar/functions/test/test-namespace/function11
8e4dcc81-3b00-4bf9-a489-1823b5514788-pulsar-functions-api-examples.jar
(CONNECTED) /> ls pulsar/functions/test/test-namespace/function12
0ee8e267-74cb-4178-99ea-6c723298223c-pulsar-functions-api-examples.jar
(CONNECTED) /> ls pulsar/functions/test/test-namespace/function13
8f1dea11-0070-434b-ba97-a42b44d8063c-pulsar-functions-api-examples.jar
(CONNECTED) />
```

- downloader is writing the package to a temp location
- after a package is downloaded, a hardlink is created to link to the temp file. hardlink will ensure one createLink succeed.
- after the hardlink is created, the temp files can be deleted.

After this change, it allows concurrent downloading without interleaving with each other.

* Use `distributedlog-core-shaded` in pulsar worker

* revert to db ledger storage

* Include netty-all

* Fix serviceUrl for functions cli

* Move the thread construction to start to avoid illegalstate

* Add more checks to see if thread var is init

* Support parallelism parameter while running functions locally

* Fixed the generation of java and python files

- the package will be generated under `dist/target/`

* Upgrade dlog dependency

* Make pulsar functions work after rebase

- bump zk version 3.5
- use the same dlog version as bookkeeper
- change standalone to use sorted ledger storage manager

(this is a temp fix to address the issues after rebase)

Refactored instance related stuff into instance as well as rejiggered utils into its own module (#248)

* Refactored instance related stuff into instance as well as rejiggered utils into its own module

* Discard empty files