Source lib/apache before lib/keystone

DevStack's lib/keystone depends on lib/apache. When lib/keystone
depends on any change introduced in lib/apache the build is broken as
lib/apache was not being sourced before that.

This change sources lib/apache just before sourcing lib/tls, as is
done in devstack/stack.sh.

Change-Id: Id0f51c678d4f16aaece08a4e5a74c48cc2ab1e6c
Merge "Source lib/apache before lib/keystone"