Remove bitlength related properties that are not needed
diff --git a/cryptography/hazmat/primitives/interfaces.py b/cryptography/hazmat/primitives/interfaces.py
index 589b748..e81abfb 100644
--- a/cryptography/hazmat/primitives/interfaces.py
+++ b/cryptography/hazmat/primitives/interfaces.py
@@ -309,7 +309,7 @@
     @abc.abstractmethod
     def generate(self):
         """
-        Generate DSAPrivateKey from the object's parameters
+        Generate DSAPrivateKey from the object's parameters.
         """
 
     @abc.abstractproperty
@@ -342,12 +342,6 @@
         """
 
     @abc.abstractproperty
-    def divisor_size(self):
-        """
-        The bit length of the divisor.
-        """
-
-    @abc.abstractproperty
     def priv_key(self):
         """
         The private key in the DSA structure.
@@ -360,18 +354,6 @@
         """
 
     @abc.abstractproperty
-    def L(self):
-        """
-        The bit length of the prime modulus. Alias for modulus_length.
-        """
-
-    @abc.abstractproperty
-    def N(self):
-        """
-        The bit length of the divisor. Alias for divisor_length.
-        """
-
-    @abc.abstractproperty
     def y(self):
         """
         The DSAPublicKey associated with this private key.