testcase/filesystem: Remove test case of lib_rdflush
testcase/filesystem: Remove test case of lib_rdflush

This patch removes test case of lib_rdflush, as it is
an internal function and it can be covered by public API.

Signed-off-by: Lokesh B V <a10c1c2561c872cd1fd5899c4340d5ec87a91507@partner.samsung.com>

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