Remove sharding code (#1260)

* truncate legacy sharding code

* fix docs

Author: pipermerriam

docs/api/eth/api.rlp.rst

@@ -9,7 +9,6 @@ RLP
 
    rlp/api.rlp.accounts
    rlp/api.rlp.blocks
-   rlp/api.rlp.collation
    rlp/api.rlp.headers
    rlp/api.rlp.logs
    rlp/api.rlp.receipts

docs/api/eth/rlp/api.rlp.collation.rst

@@ -6,10 +6,3 @@ BlockHeader
 
 .. autoclass:: eth.rlp.headers.BlockHeader
   :members:
-
-
-CollationHeader
----------------
-
-.. autoclass:: eth.rlp.headers.CollationHeader
-  :members:

docs/api/eth/rlp/api.rlp.headers.rst

@@ -53,27 +53,6 @@ class CanonicalHeadNotFound(PyEVMError):
     pass
 
 
-class CollationHeaderNotFound(PyEVMError):
-    """
-    Raised when the collation header for the given shard and period does not exist in the database.
-    """
-    pass
-
-
-class CollationBodyNotFound(PyEVMError):
-    """
-    Raised when the collation body for the given shard and period does not exist in the database.
-    """
-    pass
-
-
-class CanonicalCollationNotFound(PyEVMError):
-    """
-    Raised when no collation for the given shard and period has been marked as canonical.
-    """
-    pass
-
-
 class Halt(PyEVMError):
     """
     Raised when an opcode function halts vm execution.