test/py: Make print statements python 3.x safe

In python 3.x print must be called as a function rather than used as a
statement. Update uses of print to the function call syntax in order to
be python 3.x safe.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>

test/py/u_boot_console_sandbox.py

@@ -41,7 +41,7 @@ class ConsoleSandbox(ConsoleBase):
         bcfg = self.config.buildconfig
         config_spl = bcfg.get('config_spl', 'n') == 'y'
         fname = '/spl/u-boot-spl' if config_spl else '/u-boot'
-        print fname
+        print(fname)
         cmd = []
         if self.config.gdbserver:
             cmd += ['gdbserver', self.config.gdbserver]