[Piglit] RFC: rename test/all.tests to tests/all_tests.py

[Brian Paul]

I'd like to rename tests/all.tests (and the others) to something like 
tests/all_tests.py.

The contents of all.tests is Python code so putting the .py suffix on 
it makes sense.  Then, I'd like to be able to import that code into 
another test spec file where I do blacklisting.

For example, I want to create a test spec file "vmware_tests.py" that 
executes everything in all.tests except for stuff we don't want to 
test.  An example "vmware_tests.py" file might be something like:

import sys
sys.path.append("tests")
from all_tests import *

black_list= [
    "spec/!OpenGL 3.1/*",
    "*glean*"
]

# Remove the blacklisted tests from the test profile
for t in black_list:
    profile.remove_test(t)



As it is now we can't do "import all.tests" in Python.  Renaming to 
all_tests.py fixes that problem.

-Brian