Bitcoinabc regtest (#659)

* Add litecoin regtest to lib/coins.py

* Add BitcoinCashABC regtest mode

* pycodestyle fix

electrumx/lib/coins.py

@@ -657,6 +657,26 @@ class LitecoinTestnet(Litecoin):
     ]
 
 
+class LitecoinRegtest(LitecoinTestnet):
+    NET = "regtest"
+    GENESIS_HASH = ('530827f38f93b43ed12af0b3ad25a288'
+                    'dc02ed74d6d7857862df51fc56c416f9')
+    PEERS = []
+    TX_COUNT = 1
+    TX_COUNT_HEIGHT = 1
+
+
+class BitcoinCashABCRegtest(BitcoinTestnetMixin, Coin):
+    NAME = "BitcoinCashABC"
+    NET = "regtest"
+    PEERS = []
+    GENESIS_HASH = ('0f9188f13cb7b2c71f2a335e3a4fc328'
+                    'bf5beb436012afca590b1a11466e2206')
+    TX_COUNT = 1
+    TX_COUNT_HEIGHT = 1
+    BLOCK_PROCESSOR = block_proc.LTORBlockProcessor
+
+
 class Viacoin(AuxPowMixin, Coin):
     NAME = "Viacoin"
     SHORTNAME = "VIA"