Move fetch of DEBUG_SH from kenv to rc
We only need to check kenv for DEBUG_SH once.
We also need to export DEBUG_SH to be useful.
Sponsored by: Juniper Networks, Inc.
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D46219
Move fetch of DEBUG_SH from kenv to rc Tags None Referenced Files None Subscribers None
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