`pyimport_conda` doesn't seem to handle superseded packages correction.

Recently the main conda channel added keras-2.2.4, but some of our internal legacy code requires 1.2.2. As a result, we've been getting this superseded notice:

The following packages will be SUPERSEDED by a higher-priority channel:

  keras                            pkgs/main::keras-2.2.4-0 --> conda-forge::keras-1.2.2-py27_0

Normally this isn't an issue, but it pyimport_conda doesn't seem to finding the downgraded version:

) <type 'exceptions.ImportError'>
ImportError('cannot import name activity_l1l2',)
  File "/root/.julia/v0.6/Conda/deps/usr/lib/python2.7/site-packages/private-package/__init__.py", line 15, in <module>
    from private-package.main import run
  File "/root/.julia/v0.6/Conda/deps/usr/lib/python2.7/site-packages/private-package/main.py", line 7, in <module>
...
    from keras.regularizers import activity_l1l2    # l1l2 for weight regularization

It seems that simply re-loading the package that's using pyimport_conda in the __init__ resolves the issue.

Bắt đầu với entry point pyimport_conda và tái hiện trường hợp package bị thay thế keras 1.2.2 so với 2.2.4 được mô tả trong báo cáo. So sánh lần import ban đầu với hành vi sau khi reload package sử dụng pyimport_conda. Hoàn tất có nghĩa là package keras đã downgrade có thể được import mà không cần reload thủ công.