[Storage] Remove getSlot()

Rationale: Slot is struct that is used by the contract
to keep track of the state of a slot, it doesn't need
to be exposed on the API

contracts/Storage.sol

@@ -35,10 +35,6 @@ contract Storage is Marketplace {
     minCollateralThreshold = _minCollateralThreshold;
   }
 
-  function getSlot(SlotId slotId) public view returns (Slot memory) {
-    return _slot(slotId);
-  }
-
   function missingProofs(SlotId slotId) public view returns (uint256) {
     return _missed(_toProofId(slotId));
   }

test/Storage.test.js

@@ -2,6 +2,7 @@ const { expect } = require("chai")
 const { ethers, deployments } = require("hardhat")
 const { BigNumber } = ethers
 const { hexlify, randomBytes } = ethers.utils
+const { AddressZero } = ethers.constants
 const { exampleRequest } = require("./examples")
 const { advanceTime, advanceTimeTo, currentTime, mine } = require("./evm")
 const { requestId, slotId } = require("./ids")
@@ -120,7 +121,7 @@ describe("Storage", function () {
               await expect(
                 await storage.markProofAsMissing(id, missedPeriod)
               ).to.emit(storage, "SlotFreed")
-              await expect(storage.getSlot(id)).to.be.revertedWith("Slot empty")
+              expect(await storage.getHost(id)).to.equal(AddressZero)
             } else {
               await storage.markProofAsMissing(id, missedPeriod)
             }