juanvallejo 901c798681 prevent sorting of PATH dirs ...

This patch allows the `kubectl plugin list` command to display discovered
plugin paths in the same order as they appear in a user's PATH.
Prior to this patch, discovered plugin paths were sorted before being
displayed.

Additionally, any errors encountered while reading from any directory in a
user's PATH will now be printed to stderr at the end of the command's
output.

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..

testdata

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BUILD

prevent sorting of PATH dirs

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plugin.go

prevent sorting of PATH dirs

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