FIX: add way of completely skipping test that bugged with jessie

Tests are stored in a bash indexed array.
Bash on debian8 does not support arrays declaration and if there was no
registered tests, the array variable was seen as undefined.
With this way of completely dismissing the test suite, the problem is
fixed

tests/launch_tests.sh

@@ -26,6 +26,7 @@ tests_list=""
 testno=0
 testcount=0
 
+dismiss_test=0
 dismiss_count=0
 nbfailedret=0
 nbfailedgrep=0
@@ -71,6 +72,7 @@ clear_registered_tests() {
     unset REGISTERED_TESTS
     declare -a REGISTERED_TESTS
     dismiss_count=0
+    dismiss_test=0
 }
 
 # Generates a formated test name
@@ -84,6 +86,9 @@ make_usecase_name() {
 
 # Plays the registered test suite
 play_registered_tests() {
+    if [ "$dismiss_test" -eq 1 ]; then
+        return
+    fi
     usecase_name=$1
     if [[ "${REGISTERED_TESTS[*]}" ]]; then
         export numtest=${#REGISTERED_TESTS[@]}

tests/lib.sh

@@ -66,6 +66,10 @@ contain()
     fi
 }
 
+dismiss_test() {
+    dismiss_test=1
+}
+
 # test is expected to fail (for instance on blank system)
 # then the test wont be taken into account for test suite success
 dismiss_count_for_test() {