uniform logger manager in FleetAPI.
hidde API under distributed/utils which users don't need.

* add simple reformated ci files

* update

* add radme for new unitetsts

* add radme for new unitetsts

* add radme for new unitetsts

* reset mlu

* update for samples

* add base api

* reset some dist unit tests

* add warning in grenerated cmakelists file

* update readme for new dist unit tests

* add all collective tests

* remain base file and launcher file

* Update README.md

* Update README.md

* fix env PYTHONPATH

* Update gen_ut_cmakelists.py

* add all collective tests

* add docs for gen_ut_cmakelists.py

* pretify codes

* commont name == "name"

* update for comments

* update function's help

* update for run type

* update readme

* add all collective tests

* add all collective tests

* mv  collective test files

* update for all collective tests

* update

* update

* update

* update for all tests

* update for checking name

* Update Cmakelists.txt

* update testlist.csv

* remain test_parallel_dygraph_dataparallel in unittests

* set broadcast op all platforms

* update

* remain test_broadcast_tensors_op

* fix

* rm some collective files

* update more colective tests

* update

* update

* update
gen_ut_supports recursion

* update

* update

* update

* update

* fix nccl version

* update

* update

* update

* update

* fix a bug and try to pass

* update

* add csv

* update for timeout

* remove tcp store

* fix

* fix

* update

* update

* update for more dist tests

* move multi node tests

* update

* update

* update

* fix for auto parallele

* update

* update path in python file

* update

* reset some test in unittests

* fix

* update readme

* fix

* update

* fix port

* rename eagerpylayer

* [Eager] fix sharding under eager mode

* [Eager] fix several sharding test under eager mode

* Recover using _test_eager_guard

* Ensured fleet.init under legacy

* Ensured fleet.init under legacy

* Fix CI issue, re-definition strategy and call fleet.init() in stage2_offload

* Modified dygraph_group_sharded_api.py, move fleet.init to a better line

* add pg_gloo

* add processgroup_nccl

* fix pipeline

* fix mp pp dp

* fix utest of hybrid parallel

* add utest for tuple

* add pp dygraph, test=develop

* add pipeline layer

* add api commet; test=develop

* fix fc dtype bug; test=develop

* remove float32 in default parameter; test=develop

* fix exmpale bug; test=develop

* fix build once; test=develop

* fix num_chanels bug; test=develop

* fix install check failed bug; test=develop

* test=develop, add install check

* test=develop, add install check scripts

* test=develop, refine language

* test=develop, add api spec

* test=develop, change cdn to bj to pass ci

* Added beam search API to fluid/contrib

* Change as review comments

* API.spec change

* Doc updated

Currently, our tests run with 2 GPUs, the init time is absurdly long:
about 4s for each process.  Currently, we run each OP test on
different processes. This PR:

1. create cmake function py_test_modules which will generate the
Makefile that runs a list of Python unittest module in a single Python
process.

2. move all "python unittest compatible" (e.g., used the unittest
package, not just a regular python file). from fluid/tests to
fluid/tests/unittests.

3. cmake now will run all OP tests in fluid/tests/unittests in a
single process, except the time-consuming tests, they are separated
into different processes to utilize parallelism. Please make sure to
use the unittest package if you put the python test file in
fluid/tests/unittests

4. remove all exit(0) from fluid/tests/unittests/*.py, exit(0) is used
to disable unittest, we can not do it when running all tests in a
single process since it will terminate the process without running the
other tests. Instead, the test is disabled in
fluid/tests/unittests/CMakeLists.txt. FIXME is added for each disabled
item. Please disable the unittest from
fluid/tests/unittests/CMakeLists.txt, instead of adding exit(0) to the
Python file, for all Python file in fluid/tests/unittests/.

5. add an option WITH_FAST_BUNDLE_TEST. When OFF, will run the unit
tests in separate process so that they can be tested individually.

ISSUE=4586495

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1408 1ad973e4-5ce8-4261-8a94-b56d1f490c56