run-tests: replace '/dev/null' with os.devnull for Windows
Many of the *.py tests were dying on:
File "c:\Users\Matt\projects\hg\hgdemandimport\tracing.py", line 27, in log
_pipe = open(os.environ['HGCATAPULTSERVERPIPE'], 'w', 1)
IOError: [Errno 2] $ENOENT$: '/dev/null'
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2