scripted-diff: Remove redundant sync_all and sync_blocks

The sync calls are redundant after a call to generate, because generate
already syncs itself.

-BEGIN VERIFY SCRIPT-
perl -0777 -pi -e 's/(generate[^\n]*\)[^\n]*)(\n|\s)+self.sync_(all|blocks)\([^\)]*\)\n/\1\n/g' $(git grep -l generate ./test)
-END VERIFY SCRIPT-

test/functional/p2p_sendheaders.py

@@ -217,7 +217,6 @@ class SendHeadersTest(BitcoinTestFramework):
 
         # make sure all invalidated blocks are node0's
         self.generatetoaddress(self.nodes[0], length, self.nodes[0].get_deterministic_priv_key().address)
-        self.sync_blocks(self.nodes, wait=0.1)
         for x in self.nodes[0].p2ps:
             x.wait_for_block_announcement(int(self.nodes[0].getbestblockhash(), 16))
             x.clear_block_announcements()
@@ -226,7 +225,6 @@ class SendHeadersTest(BitcoinTestFramework):
         hash_to_invalidate = self.nodes[1].getblockhash(tip_height - (length - 1))
         self.nodes[1].invalidateblock(hash_to_invalidate)
         all_hashes = self.generatetoaddress(self.nodes[1], length + 1, self.nodes[1].get_deterministic_priv_key().address)  # Must be longer than the orig chain
-        self.sync_blocks(self.nodes, wait=0.1)
         return [int(x, 16) for x in all_hashes]
 
     def run_test(self):