dynamic client: restore discovery client exception handling

[roycaihw]

fixes the flake in kubernetes-client/python#1281.

With #187, the meta_request now raises NotFoundError instead of ResourceNotFoundError if discovery doc is not ready.

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[codecov-io]

Codecov Report

Merging #215 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #215   +/-   ##
=======================================
  Coverage   92.29%   92.29%           
=======================================
  Files          13       13           
  Lines        1635     1635           
=======================================
  Hits         1509     1509           
  Misses        126      126           

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[roycaihw]

example failure: https://travis-ci.org/github/kubernetes-client/python-base/builds/735584773

[roycaihw]

/cc @fabianvf

The test still fails. I cannot tell if this behavior change was intended. @fabianvf Do you remember?

-                    try:
-                        resourcePart.resources = self.get_resources_for_api_version(prefix,
-                            group, part, resourcePart.preferred)
-                    except NotFoundError:
-                        raise ResourceNotFoundError
+                    resourcePart.resources = self.get_resources_for_api_version(
+                        prefix, group, part, resourcePart.preferred)

[fabianvf]

@roycaihw not sure why I would have dropped that exception, probably was an issue pulling the PR from the openshift repo

[yliaog]

/lgtm

[roycaihw]

@fabianvf Got it, thanks. I restored the exception and now the test passes