test/py: README: add HOSTNAME to PYTHONPATH

As opposed to PATH, HOSTNAME is not appended to PYTHONPATH
automatically. Lets add it to the examples to make it more
obvious to new users.

Signed-off-by: Liam Beguin <liambeguin@gmail.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>

test/py/README.md

@@ -320,7 +320,7 @@ If U-Boot has already been built:
 
 ```bash
 PATH=$HOME/ubtest/bin:$PATH \
-    PYTHONPATH=${HOME}/ubtest/py:${PYTHONPATH} \
+    PYTHONPATH=${HOME}/ubtest/py/${HOSTNAME}:${PYTHONPATH} \
     ./test/py/test.py --bd seaboard
 ```
 
@@ -331,7 +331,7 @@ follow:
 ```bash
 CROSS_COMPILE=arm-none-eabi- \
     PATH=$HOME/ubtest/bin:$PATH \
-    PYTHONPATH=${HOME}/ubtest/py:${PYTHONPATH} \
+    PYTHONPATH=${HOME}/ubtest/py/${HOSTNAME}:${PYTHONPATH} \
     ./test/py/test.py --bd seaboard --build
 ```