runfiles,python: add a method to discover runfiles #5233
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The new method discovers the runfiles manifest and
runfiles directory using the values of the
RUNFILES_MANIFEST_FILE and RUNFILES_DIR envvars
(if specified), and if needed, also looks for them
next to sys.argv[0].
This commit is a copy of 9f2b052
ported from C++ to Python.
See #4460
Change-Id: I6916366ca73575703fe39ce69020eec3b54457bf