Reactored ready pod controller code to user lister and cache sync checks,
so that we avoid querying lister if cache is not synced in choodPod function.
Also, as noticied in #2258 we were initializing workqueue in goroutine
which was causing nil pointer reference. We have moved it out of goroutine
and kept specific parts in goroutine.
Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>