Raise PRNG seed log to INFO.

Some build infrastructure, such as Nix, will delete failed builds by default, keeping only the log of the failed build.

For flaky tests, it would be very helpful to have the PRNG seed in the default log in order to redo the failed test.

By simply raising the PRNG seed logging to INFO, we can, by default, record the seed in the log of every build.

test/functional/test_framework/test_framework.py

@@ -279,10 +279,10 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         if seed is None:
             seed = random.randrange(sys.maxsize)
         else:
-            self.log.debug("User supplied random seed {}".format(seed))
+            self.log.info("User supplied random seed {}".format(seed))
 
         random.seed(seed)
-        self.log.debug("PRNG seed is: {}".format(seed))
+        self.log.info("PRNG seed is: {}".format(seed))
 
         self.log.debug('Setting up network thread')
         self.network_thread = NetworkThread()