Drop 0.001 BTC lot size

Subject to ETHBTC price fluctuation, it's very easy for 0.001 BTC to
require fewer bonds than the opening fee, at which point deposit opening
will fail. We still allow for 0.001 BTC lot size to be used in tests.

solidity/contracts/system/TBTCSystem.sol

@@ -78,7 +78,7 @@ contract TBTCSystem is Ownable, ITBTCSystem, DepositLog {
     uint16 private initialCollateralizedPercent = 150; // percent
     uint16 private undercollateralizedThresholdPercent = 125;  // percent
     uint16 private severelyUndercollateralizedThresholdPercent = 110; // percent
-    uint64[] lotSizesSatoshis = [10**5, 10**6, 10**7, 2 * 10**7, 5 * 10**7, 10**8]; // [0.001, 0.01, 0.1, 0.2, 0.5, 1.0] BTC
+    uint64[] lotSizesSatoshis = [10**6, 10**7, 2 * 10**7, 5 * 10**7, 10**8]; // [0.01, 0.1, 0.2, 0.5, 1.0] BTC
 
     uint256 constant governanceTimeDelay = 48 hours;
     uint256 constant keepFactoriesUpgradeabilityPeriod = 180 days;

solidity/contracts/test/system/TBTCSystemStub.sol

@@ -12,6 +12,7 @@ contract TBTCSystemStub is TBTCSystem {
         TBTCSystem(_priceFeed, _relay)
     public {
         // solium-disable-previous-line no-empty-blocks
+        lotSizesSatoshis = [10**5, 10**6, 10**7, 2 * 10**7, 5 * 10**7, 10**8]; // [0.01, 0.1, 0.2, 0.5, 1.0] BTC
     }
 
     function setOraclePrice(uint256 _oraclePrice) external {

solidity/test/helpers/fullDeployer.js

@@ -1,5 +1,5 @@
 const {contract} = require("@openzeppelin/test-environment")
-const {deploySystem} = require("./utils.js")
+const {deploySystem, increaseTime} = require("./utils.js")
 
 const Deposit = contract.fromArtifact("Deposit")
 const BytesLib = contract.fromArtifact("BytesLib")
@@ -153,6 +153,10 @@ async function deployAndLinkAll(additions = [], substitutions = {}) {
     1,
   )
 
+  await tbtcSystem.beginLotSizesUpdate([100000, 1e8])
+  await increaseTime(48 * 60 * 60 + 1)
+  await tbtcSystem.finalizeLotSizesUpdate()
+
   const setupFee = await tbtcSystem.getNewDepositFeeEstimate()
   await ecdsaKeepStub.setBondAmount(setupFee)
   await ecdsaKeepStub.send(setupFee)