of14: Correct documentation and example of get config reply flags
of14: Correct documentation and example of get config reply flags

* Flags is a bitmap of OFPC_FRAG_* values rather than a
  single OFPC_FRAG_* value
* OFPC_FRAG_MASK is not a valid bitmap field

Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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