We build a separate jar for BashJavaUtils with bundled log4j classes and
a configuration that logs to the stdout. Using this jar we run the
utility to capture the output. Out of the last line we extract jvm
parameters. The rest we pass as an environment variable (INHERITED_LOGS)
to the TaskManager process.

As part of the EnvironmentInformation printing we log whatever was
passed through the INHERITED_LOGS in the TM/JM process.

This closes #10850

[FLINK-15145][dist][config] Increase the TM process memory size in default flink-conf.yaml to 1568MB.

- Correct the description of process memory size.
- Provide the alternative flink memory size.

[FLINK-15517][Runtime][Configuration][Network] Use back 'network' in 'shuffle' memory config option names

This avoids that log messages to stdout intermingle with BashJavaUtils'
computation result which is also printed to stdout.

This closes #10804.

kubernetes-entry.sh is used for JobManager and TaskManager container entrypoint.
kubernetes-session.sh is used for starting session cluster.

This closes #10246 .

[FLINK-13986][core][config] Remove legacy config option TaskManagerOptions#TASK_MANAGER_HEAP_MEMORY.

    - TM startup scripts calls java code to set flip49 TM resource configs and JVM parameters
    - Launches TaskExecutors on Yarn/Mesos with JVM parameters and dynamic configs generated from TaskExecutorResourceSpec
    - Use TaskExecutorResourceSpec to calculate memory for ShuffleEnvironment and MemoryManager in TM

[FLINK-13983][runtime] Introduce 'BashJavaUtils' allowing bash scripts to call java codes for generating TM resource dynamic configurations and JVM parameters.

[hotfix][dist] Refactor 'TaskManagerHeapSizeCalculationJavaBashTest', abstract 'JavaBashTestBase' for executing testing bash scripts from java classes.

[FLINK-14581][python] Let python UDF execution no longer rely on the flink directory structure to support running python UDFs on yarn.

This commit adds pyflink-udf-runner.sh, pyflink.zip, py4j-0.10.8.1-src.zip and
cloudpickle-1.2.2-src.zip as resources into flink-python-{VERSION}.jar and extract
during runtime. In this way, we don't need to care about the file path.

This closes #10061.

The -E parameter is a FreeBSD/MacOS feature while -r is GNU. It's hard
to know which of -E/-r to use.

[hotfix] Rename `TaskManagerOptions#MANAGED_MEMORY_SIZE` and `TaskManagerOptions#MANAGED_MEMORY_FRACTION` with prefix `LEGACY_`.

This is to avoid naming conflict with the new config options.

This closes #9746.

This closes #9655

This closes #9367

* Add new Docker Playgrounds section to Getting Started documenation section
* Add new count click events example jobs

This closes #9192.

This closes #9133.