mod_admin_shell: Allow matching on host or bare JID in c2s:show Only supporting exact match on full JID isn't helpful if you want to list sessions per host or user. Backport of 430333198e4c Fixes #1857

local xpcall = xpcall;

if select(2, xpcall(function (x) return x end, function () end,  "test")) ~= "test" then
	xpcall = require"util.compat".xpcall;
end

return {
	xpcall = xpcall;
};