Add support for running tests with debug Python versions

They are failing due to `[NNNN refs]` entries in daemon log and when switching 
modes in zsh without daemon, but who cares.

tests/test_shells/postproc.py

@@ -28,6 +28,7 @@ except IOError:
 hostname = socket.gethostname()
 user = os.environ['USER']
 
+REFS_RE = re.compile(r'^\[\d+ refs\]\n')
 IPYPY_DEANSI_RE = re.compile(r'\033(?:\[(?:\?\d+[lh]|[^a-zA-Z]+[a-ln-zA-Z])|[=>])')
 
 with codecs.open(fname, 'r', encoding='utf-8') as R:
@@ -42,6 +43,8 @@ with codecs.open(fname, 'r', encoding='utf-8') as R:
 			line = line.translate({
 				ord('\r'): None
 			})
+			if REFS_RE.match(line):
+				continue
 			line = line.replace(hostname, 'HOSTNAME')
 			line = line.replace(user, 'USER')
 			if pid is not None:

tests/test_shells/test.sh

@@ -91,8 +91,11 @@ run_test() {
 	SH="$1"
 	SESNAME="powerline-shell-test-${SH}-$$"
 
+	# Note: when running screen with setuid libc unsets LD_LIBRARY_PATH, so it 
+	# cannot be added to the `env -i` call above.
 	run "${TEST_TYPE}" "${TEST_CLIENT}" "${SH}" \
 		screen -L -c tests/test_shells/screenrc -d -m -S "$SESNAME" \
+			env LD_LIBRARY_PATH="${LD_LIBRARY_PATH}" \
 			"$@"
 	while ! screen -S "$SESNAME" -X readreg a tests/test_shells/input.$SH ; do
 		sleep 0.1s