mv os.urandom sanity check to main __init__.py

cool check but I am going to delete rsakey.py

electrum/__init__.py

@@ -46,3 +46,10 @@ except AssertionError:
 else:
     raise ImportError("Running with asserts disabled. Refusing to continue. Exiting...")
 
+
+# Check that os.urandom works
+import zlib
+length = len(zlib.compress(os.urandom(1000)))
+if length <= 900:
+    raise ImportError("Broken PRNG. Refusing to continue. Exiting...")
+

electrum/rsakey.py

@@ -46,10 +46,6 @@ def SHA1(x):
 # PRNG Functions
 # **************************************************************************
 
-# Check that os.urandom works
-import zlib
-length = len(zlib.compress(os.urandom(1000)))
-assert length > 900
 
 def getRandomBytes(howMany):
     b = bytearray(os.urandom(howMany))