vle: switch API/ABI to 1.2
utils: fix regular expression in unit test package

According to the boost::regex::grep expression, we simplify the
test_package from '.*0' to '0$' and '.*[1|2]' to '[1|2]$'. To improve
research in package, we use the boost::regex_search instead of
'boost::regex_match'. (Closes #159).