shared/util: Removes GetStableRandomInt64FromList and GetStableRandomGenerator from shared pkg
shared/util: Removes GetStableRandomInt64FromList and GetStableRandomGenerator from shared pkg

Will be moved to lxd/util package as is exlusively used by server side code currently.

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

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