[part8]Remove singleclient outdated api

[luqiang-guo]

删除multiclient 下single client的接口

总删除列表

此pr完成了一部分接口清理。

• JobConfigProto
• ConfigProto
• Session
• cast_to_current_logical_view
• truncated_normal
• name_scope
• get_all_variables

[doombeaker]

其实这种包（tan.py 文件，而不是 tan.py 文件中的 tan 函数），也是多余导出的。
可以顺遍删除了（不用在这个PR中）。

注意这里的大部分是多余的，但不是所有是多余的，比如 oneflow.nn.image 就真是一个 sub pakcage。
但是像 tan、sinh 等这些和 op 重名的 pakcage，都会被后面的代码导入的op覆盖，在这里是多余的。

[github-actions]

Speed stats:

GPU Name: GeForce GTX 1080 

PyTorch resnet50 time: 140.4ms (= 7020.8ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 128.2ms (= 6410.0ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
Relative speed: 1.10 (= 140.4ms / 128.2ms)

PyTorch resnet50 time: 85.9ms (= 4297.0ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 74.3ms (= 3716.7ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
Relative speed: 1.16 (= 85.9ms / 74.3ms)

PyTorch resnet50 time: 57.1ms (= 2854.1ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 47.3ms (= 2366.8ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
Relative speed: 1.21 (= 57.1ms / 47.3ms)

PyTorch resnet50 time: 48.5ms (= 2426.9ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 44.5ms (= 2223.3ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
Relative speed: 1.09 (= 48.5ms / 44.5ms)

PyTorch resnet50 time: 42.1ms (= 2105.7ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 45.5ms (= 2273.6ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
Relative speed: 0.93 (= 42.1ms / 45.5ms)

[github-actions]

Speed stats:

GPU Name: GeForce GTX 1080 

PyTorch resnet50 time: 137.9ms (= 6893.7ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 126.2ms (= 6307.6ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
Relative speed: 1.09 (= 137.9ms / 126.2ms)

PyTorch resnet50 time: 81.0ms (= 4047.6ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 72.8ms (= 3639.9ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
Relative speed: 1.11 (= 81.0ms / 72.8ms)

PyTorch resnet50 time: 56.9ms (= 2843.4ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 47.9ms (= 2393.6ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
Relative speed: 1.19 (= 56.9ms / 47.9ms)

PyTorch resnet50 time: 47.6ms (= 2379.3ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 42.3ms (= 2112.8ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
Relative speed: 1.13 (= 47.6ms / 42.3ms)

PyTorch resnet50 time: 39.9ms (= 1996.5ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 50.2ms (= 2508.6ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
Relative speed: 0.80 (= 39.9ms / 50.2ms)