Add faction requirement to wsg rep gear

[Xudo]

Current situation:
Items sold by warsong quartermasters are visible only when you have appropriate reputation
Kelm Hargunth <Warsong Supply Officer> https://database.turtle-wow.org/?npc=14754
Illiyana Moonblaze <Silverwing Supply Officer> https://database.turtle-wow.org/?npc=14753
But items themselves don't require any reputation to equip.

Proposal is:
Items should require reputation to equip, but visible to everyone

I believe most people doesn't even know that wsg has reputational gear for lvl 18 because it is not visible for them.
I expect that visibility of rewards will slightly increase chances that people join battleground