tests: use repr.py to avoid binary characters in test output

tests/test-hgweb-commands

@@ -49,7 +49,8 b' echo % lookup'
 echo % branches
 "$TESTDIR/get-with-headers.py" 127.0.0.1:$HGPORT '?cmd=branches'
 echo % changegroup
-"$TESTDIR/get-with-headers.py" 127.0.0.1:$HGPORT '?cmd=changegroup'
+"$TESTDIR/get-with-headers.py" 127.0.0.1:$HGPORT '?cmd=changegroup' \
+    | $TESTDIR/repr.py
 echo % stream_out
 "$TESTDIR/get-with-headers.py" 127.0.0.1:$HGPORT '?cmd=stream_out'
 echo % failing unbundle, requires POST request

tests/test-simplemerge-cmd

@@ -47,7 +47,7 b' cat orig >> binary-local'
 python simplemerge -p binary-local base other
 
 echo '% binary file --text'
-python simplemerge -a -p binary-local base other
+python simplemerge -a -p binary-local base other 2>&1 | $TESTDIR/repr.py
 
 echo '% help'
 python simplemerge --help