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Closes issue #4338 Uses a wrapper function around both the signedHeader and validatorSet calls to the primary provider which attempts to retrieve the information 5 times before deeming the provider unavailable and replacing the primary provider with the first alternative before trying recursively again (until all alternatives are depleted) Employs a mutex lock for any operations involving the providers of the light client to ensure no operations occurs whilst the new primary is chosen. Commits: * created swapProvider function * eliminates old primary provider after replacement. Uses a mutex when changing providers * renamed to replaceProvider * created wrapped functions for signed header and val set * created test for primary provider replacement * implemented suggested revisions * created Witnesses() and Primary() * modified backoffAndJitterTime * modified backoffAndJitterTime * changed backoff base and jitter to functional arguments * implemented suggested changes * removed backoff function * changed exp function to match go version * halved the backoff time * removed seeding and added comments * fixed incorrect test * extract backoff timeout calc into a function Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>