pip-30 Allow team to manage vault ceilings

According to 0xtutti's pip-30 : Authorized team to manage vault ceilings.

Give the ability to the team to independently manage vault ceilings and emergency closing. Vaults ceilings movement should not exceed 20% increase or decrease in 2 weeks time. In exceptional market events, the team can reduce a vault’s ceiling so no extra borrows can be done. Vault parameters can still be passed by votes if the community deems it necessary.

pip-30 detail: https://gov.jpegd.io/t/allow-team-to-manage-vault-ceilings/173