piglit-run.py: Conform to PEP8 style guidelines

Includes changes per PEP8:
 - Maximum line width should be 79 characters
 - line breaks should be joined using either hanging indents or by
   python's implicit joins on quotes, brackets, braces, parentheses
 - each import should have its own line unless importing multiple
   classes from one module

Signed-off-by: Dylan Baker <baker.dylan.c@gmail.com>
piglit-summary.py: Conform to PEP8 style guidelines

Using hanging indents to keep lines under 79 characters long

Signed-off-by: Dylan Baker <baker.dylan.c@gmail.com>
piglit-print-commands.py: conform with PEP8 guidelines

Includes changes per PEP8:
 - Only one import should be defined per line
 - line breaks should be joined using either hanging indents or by
   python's implicit joins on quotes, brackets, braces, parentheses
 - Maximum line length of 79 lines

Signed-off-by: Dylan Baker <baker.dylan.c@gmail.com>
generate-glean-tests.py: Conform with PEP8

Two blank lines between top level function and class definitions

Signed-off-by: Dylan Baker <baker.dylan.c@gmail.com>
piglit-merge-results.py: conform to PEP8 style guidelines

- each import should be on it's own line
- two blank lines between function and class definitions

Signed-off-by: Dylan Baker <baker.dylan.c@gmail.com>