Ignore too-long redeemScripts while loading wallet

This avoids that long redeemScripts that were grandfathered in
prevent the wallet from loading.

Fixes #4313.
Merge pull request #4316

18116b0 Ignore too-long redeemScripts while loading wallet (Wladimir J. van der Laan)
bitcoin-cli, rpcclient: prefer EXIT_FAILURE cstdlib constant

A more complex construction via abs() yields the same end result.

Rebased-From: 34ff109
Rebased-By: Wladimir J. van der Laan <laanwj@gmail.com>
Remove cli functionality from bitcoind

As it says on the tin. It was deprecated in version 0.9, and
at some point it should be removed.

Removes the dependency of bitcoind on libbitcoin-cli.a. Move
some functions that used to be shared but are now only used in
bitcoin-cli.cpp to that file.

After this change, an error is printed (and exit code 1 is returned)
when the user tries to send RPC commands using bitcoind.