app/rest_firewall: add API for VLAN configuration
app/rest_firewall: add API for VLAN configuration

add REST-API for VLAN configuration of rest_firewall application.
it implements handling each vlan groups separately.

This update(v1->v2) contains the following change. make function of
 conversion of cookie and ruleID for easily understanding.

Signed-off-by: WATANABE Fumitaka <6c314859a5392f5f0c2f5e010c7240be8063009a@nttcom.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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