set reasonable value for bonding_duration in chainspec staging config (#2289)

* set reasonable value for bonding_duration in chainspec staging config

* set default bonding_duration to 1, and bump runtime version

* Update node/cli/src/chain_spec.rs

Co-Authored-By: mnaamani <mokhtar.naamani@gmail.com>

* Update node/cli/src/chain_spec.rs

Co-Authored-By: mnaamani <mokhtar.naamani@gmail.com>

* Update srml/staking/src/lib.rs

Co-Authored-By: mnaamani <mokhtar.naamani@gmail.com>