qa/coccinelle: fix false positive in setter getter

qa/coccinelle: fix false positive in setter getter

Coccinelle test was doing a false positive on the function
AppLayerParserStateSetFlag and AppLayerParserStateIssetFlag.
To address that, this patch adds a new coccinelle markup:

 /* coccinelle: AppLayerParserStateSetFlag():2,2:APP_LAYER_PARSER_ */

It indicates that AppLayerParserStateSetFlag is a setter and getter
and that the checks should be disabled inside the function.

Currently this markup is only used for that but following patch will
add some checks on option value.