save wallet label in keystore, to facilitate pairing

lib/keystore.py

@@ -49,6 +49,7 @@ class KeyStore(PrintError):
     def can_import(self):
         return False
 
+
 class Software_KeyStore(KeyStore):
 
     def __init__(self):
@@ -70,7 +71,6 @@ class Software_KeyStore(KeyStore):
         return decrypted
 
 
-
 class Imported_KeyStore(Software_KeyStore):
     # keystore for imported private keys
 
@@ -459,9 +459,13 @@ class Hardware_KeyStore(KeyStore, Xpub):
         # handler.  The handler is per-window and preserved across
         # device reconnects
         self.xpub = d.get('xpub')
+        self.label = d.get('label')
         self.derivation = d.get('derivation')
         self.handler = None
 
+    def set_label(self, label):
+        self.label = label
+
     def may_have_password(self):
         return False
 
@@ -474,6 +478,7 @@ class Hardware_KeyStore(KeyStore, Xpub):
             'hw_type': self.hw_type,
             'xpub': self.xpub,
             'derivation':self.derivation,
+            'label':self.label,
         }
 
     def unpaired(self):