As Apache now being used for multiple services (repo, keystone, horizon
and skyline), it makes sense to slightly increase threads limit in
order to not face connectivity issues while HAProxy checks status,
fetching wheels or generic operations.
Hopefully, this will reduce intermittent failures while talking to repo
server or running tempest tests.
Change-Id: I8210cc588cf3e88730d90f860b23023b296d7ea2
59ec4725d7