Add more quotes in the test scripts

src/test/test_bt.sh

@@ -3,7 +3,7 @@
 
 exitcode=0
 
-${builddir:-.}/src/test/test-bt-cl assert | ${PYTHON:-python} "${abs_top_srcdir:-.}/src/test/bt_test.py" || exitcode=1
-${builddir:-.}/src/test/test-bt-cl crash  | ${PYTHON:-python} "${abs_top_srcdir:-.}/src/test/bt_test.py" || exitcode=1
+"${builddir:-.}/src/test/test-bt-cl" assert | "${PYTHON:-python}" "${abs_top_srcdir:-.}/src/test/bt_test.py" || exitcode=1
+"${builddir:-.}/src/test/test-bt-cl" crash  | "${PYTHON:-python}" "${abs_top_srcdir:-.}/src/test/bt_test.py" || exitcode=1
 
 exit ${exitcode}

src/test/test_ntor.sh

@@ -3,7 +3,7 @@
 
 exitcode=0
 
-${PYTHON:-python} "${abs_top_srcdir:-.}/src/test/ntor_ref.py" test-tor || exitcode=1
-${PYTHON:-python} "${abs_top_srcdir:-.}/src/test/ntor_ref.py" self-test || exitcode=1
+"${PYTHON:-python}" "${abs_top_srcdir:-.}/src/test/ntor_ref.py" test-tor || exitcode=1
+"${PYTHON:-python}" "${abs_top_srcdir:-.}/src/test/ntor_ref.py" self-test || exitcode=1
 
 exit ${exitcode}

src/test/test_zero_length_keys.sh

@@ -3,8 +3,8 @@
 
 exitcode=0
 
-${SHELL:-sh} "${abs_top_srcdir:-.}/src/test/zero_length_keys.sh" "${builddir:-.}/src/or/tor" -z || exitcode=1
-${SHELL:-sh} "${abs_top_srcdir:-.}/src/test/zero_length_keys.sh" "${builddir:-.}/src/or/tor" -d || exitcode=1
-${SHELL:-sh} "${abs_top_srcdir:-.}/src/test/zero_length_keys.sh" "${builddir:-.}/src/or/tor" -e || exitcode=1
+"${SHELL:-sh}" "${abs_top_srcdir:-.}/src/test/zero_length_keys.sh" "${builddir:-.}/src/or/tor" -z || exitcode=1
+"${SHELL:-sh}" "${abs_top_srcdir:-.}/src/test/zero_length_keys.sh" "${builddir:-.}/src/or/tor" -d || exitcode=1
+"${SHELL:-sh}" "${abs_top_srcdir:-.}/src/test/zero_length_keys.sh" "${builddir:-.}/src/or/tor" -e || exitcode=1
 
 exit ${exitcode}