* Use StandaloneExecutor in FleetExecutor

* Update FLAGS

* Fix CI errors

* Update code

* Add force_root_scope_vars config

* Update code

* Fix CI errors

* Fix test_layer_new errors

* fix feature_value.h and feature_value.cu to support pslib

* code style

* align DistPsArch pre-stable branch
---------
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Co-authored-by: NTomasz Socha <tomasz.socha@intel.com>
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Co-authored-by: NHongyuJia <jiahongyu@baidu.com>
Co-authored-by: Npangyoki <pangyoki@126.com>
Co-authored-by: NLoneRanger <836253168@qq.com>
Co-authored-by: NTeFeng Chen <ctfeng66@163.com>
Co-authored-by: NLeo Guo <58431564+ZibinGuo@users.noreply.github.com>
Co-authored-by: Nxiaoting <31891223+tink2123@users.noreply.github.com>
Co-authored-by: N201716010711 <87008376+201716010711@users.noreply.github.com>
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Co-authored-by: NPuQing <me@puqing.work>
Co-authored-by: NZhang Jun <ewalker@live.cn>
Co-authored-by: NCharles-hit <56987902+Charles-hit@users.noreply.github.com>
Co-authored-by: Nniuliling123 <51102941+niuliling123@users.noreply.github.com>
Co-authored-by: Nwenbin <wang3323032@qq.com>
Co-authored-by: Nwangshengxiang <121413869+shengxiangwang@users.noreply.github.com>
Co-authored-by: NBo Zhang <105368690+zhangbopd@users.noreply.github.com>
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Co-authored-by: NLeo Chen <chenqiuliang@baidu.com>
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Co-authored-by: Nwuhuachaocoding <77733235+wuhuachaocoding@users.noreply.github.com>
Co-authored-by: NCcc <52520497+juncaipeng@users.noreply.github.com>

* back fl

* delete ssl cert

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* make warning

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* unittest paral degree

* solve unittest

* heter & multi cloud commm ready

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