add option --saved-state-ignore-hhconfig similar to --ignore-hh-version
Summary:
Allows to load an existing saved state even if the hash of .hhconfig does not match the one in the saved state DB.
NB: I didn't call the option --ignore-hhconfig because:
* I would understand that option as "just take default config instead of reading from .hhconfig"
* --ignore-hh-version is not just for saved states but also differences in versions between hh_client and hh_server if I understand well.
Reviewed By: dabek
Differential Revision:
D13840399
fbshipit-source-id:
419a22ce60240f2a93ef3db1d04d141c735a4cc0