Move platform independent tests to a shared runfile

Tests that aren't limited to running on Linux can be moved to a common
runfile to be shared with other platforms.

The test runner and wrapper script are enhanced to allow specifying
multiple runfiles as a comma-separated list. The default runfiles are
now "common.run,PLATFORM.run" where PLATFORM is determined at run time.

Sections in runfiles that share a path with another runfile can append
a colon separator and an identifier to the path in the section
name, ie `[tests/functional/atime:Linux]`, to avoid overriding the tests
specified by other runfiles.

Reviewed-by: Jorgen Lundman <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: John Kennedy <[email protected]>
Signed-off-by: Ryan Moeller <[email protected]>
Closes #9391 

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