Backports for beta 2.2.5 (#10047)

* bump beta to 2.2.5

* Fix empty steps (#9939)

* Don't send empty step twice or empty step then block.

* Perform basic validation of locally sealed blocks.

* Don't include empty step twice.

* Strict empty steps validation (#10041)

* Add two failings tests for strict empty steps.

* Implement strict validation of empty steps.

* ethcore: enable constantinople on ethereum (#10031)

* ethcore: change blockreward to 2e18 for foundation after constantinople

* ethcore: delay diff bomb by 2e6 blocks for foundation after constantinople

* ethcore: enable eip-{145,1014,1052,1283} for foundation after constantinople

* Change test miner max memory to malloc reports. (#10024)

* Fix: test corpus_inaccessible panic (#10019)

If system uptime is less than the duration in the test, thread
will panic due to: 'overflow when subtracting duration from instant'.

Changed duration to 20 seconds to make it unlikely the test will
fail due to this condition.

Since no operations that carry a similar risk of panic occur outside
of the tests, it doesn't seem warranted to depend on an external crate
to fix this.

* Bump crossbeam. (#10048)

ethcore/res/ethereum/foundation.json

@@ -9,7 +9,8 @@
 				"durationLimit": "0x0d",
 				"blockReward": {
 					"0": "0x4563918244F40000",
-					"4370000": "0x29A2241AF62C0000"
+					"4370000": "0x29A2241AF62C0000",
+					"7080000": "0x1BC16D674EC80000"
 				},
 				"homesteadTransition": "0x118c30",
 				"daoHardforkTransition": "0x1d4c00",
@@ -134,7 +135,8 @@
 				],
 				"eip100bTransition": 4370000,
 				"difficultyBombDelays": {
-					"4370000": 3000000
+					"4370000": 3000000,
+					"7080000": 2000000
 				}
 			}
 		}
@@ -159,7 +161,11 @@
 		"eip140Transition": 4370000,
 		"eip211Transition": 4370000,
 		"eip214Transition": 4370000,
-		"eip658Transition": 4370000
+		"eip658Transition": 4370000,
+		"eip145Transition": 7080000,
+		"eip1014Transition": 7080000,
+		"eip1052Transition": 7080000,
+		"eip1283Transition": 7080000
 	},
 	"genesis": {
 		"seal": {