start adding new rpc calls

Signed-off-by: David Maloney <DMaloney@rapid7.com>
Merge branch 'staging/electro-release' into feature/MSP-9641/cred-rpc-calls
add credential rpc calls
remove old rpc methods

added rpc methods to create new creds
removing the old methods for
the obsolete cred models
remove rpg_get_auth_info

this is an rpc call that calls a method that
does not even exist...
WAT?!
Merge pull request #3576 from dmaloney-r7/feature/MSP-9641/cred-rpc-calls

Feature/msp 9641/cred roc calls

MSP-9641 #land