lxd/cluster/gateway: Removes dqliteProxy idle timeout
lxd/cluster/gateway: Removes dqliteProxy idle timeout

Without protocol level heartbeats or regular query/raft activity this cannot be reliable and will cause periodic reconnects.

Removing this until we can revisit it.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

hallyn/lxd,stgraber/lxd,hallyn/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd