ignore: refactor file read into a function This refactors the ignore file reading code into a function so that in a future patch we can make it recursive.

import-checker: loop to get list of locally defined modules at first This is a preparation for subsequent patches, which expect that all locally defined (= mercurial specific) modules are already known before examinations. Looping twice for specified modules is a little redundant, but reasonable cost for improvement in subsequent patches.

import-checker: add xargs like mode Before this patch, "import-check.py" is invoked via "xargs" in "test-module-imports.t", but it doesn't ensure that "import-checker.py" is certainly invoked with all mercurial specific files at once. "xargs" may invoke specified command multiple times with part of arguments given from stdin: according to "xargs(1)" man page, this dividing arguments is system-dependent. This patch adds "xargs" like mode to "import-checker.py". This can ensure that "import-checker.py" is certainly invoked with all mercurial specific files at once in "test-module-imports.t". This is assumed by subsequent patches.

store: add comment in _hashencode with reason for skipping the first 5 chars

test-run-tests: fix for Python 3.5 This test now passes in both 3.5 and 2.6.

run-tests: make sure all script lines are bytes

run-tests: fix checking a line to see if it needs globbing

run-tests: unblock running python tests in python 3 This makes it clear we need to ban os.popen, but we'll do that in a later cleanup.