remote-helpers: tests: use python directly

These remote helpers use 'env python', not PYTHON_PATH, so that's where
we should check for the extensions. Otherwise, if 'python' is not
PYTHON_PATH (e.g. /usr/bin/python: Makefile's default), there will be a
mismatch between the python libraries actually accessible to the remote
helpers.

Suggested by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/remote-helpers/test-bzr.sh

@@ -12,7 +12,7 @@ if ! test_have_prereq PYTHON; then
 	test_done
 fi
 
-if ! "$PYTHON_PATH" -c 'import bzrlib'; then
+if ! python -c 'import bzrlib'; then
 	skip_all='skipping remote-bzr tests; bzr not available'
 	test_done
 fi

contrib/remote-helpers/test-hg-bidi.sh

@@ -15,7 +15,7 @@ if ! test_have_prereq PYTHON; then
 	test_done
 fi
 
-if ! "$PYTHON_PATH" -c 'import mercurial'; then
+if ! python -c 'import mercurial'; then
 	skip_all='skipping remote-hg tests; mercurial not available'
 	test_done
 fi

contrib/remote-helpers/test-hg-hg-git.sh

@@ -15,12 +15,12 @@ if ! test_have_prereq PYTHON; then
 	test_done
 fi
 
-if ! "$PYTHON_PATH" -c 'import mercurial'; then
+if ! python -c 'import mercurial'; then
 	skip_all='skipping remote-hg tests; mercurial not available'
 	test_done
 fi
 
-if ! "$PYTHON_PATH" -c 'import hggit'; then
+if ! python -c 'import hggit'; then
 	skip_all='skipping remote-hg tests; hg-git not available'
 	test_done
 fi

contrib/remote-helpers/test-hg.sh

@@ -15,7 +15,7 @@ if ! test_have_prereq PYTHON; then
 	test_done
 fi
 
-if ! "$PYTHON_PATH" -c 'import mercurial'; then
+if ! python -c 'import mercurial'; then
 	skip_all='skipping remote-hg tests; mercurial not available'
 	test_done
 fi