we suspect the current situation of causing a crash on shutdown after
the tokenmap unit test:

(gdb) bt 20
__gnu_cxx::new_allocator<std::__detail::_Hash_node_base*>::deallocate
(this=0x7fffffff52c7, __p=0x78a700)
    at
/opt/rh/devtoolset-2/root/usr/include/c++/4.8.2/ext/new_allocator.h:110
std::allocator<rtl::OUString>, std::__detail::_Identity,
std::equal_to<rtl::OUString>, rtl::OUStringHash,
std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
std::__detail::_Prime_rehash_policy,
std::__detail::_Hashtable_traits<true, true, true>
>::_M_deallocate_buckets (
    this=0x2aaab3166640 <XMLPropStyleContext::maParaSet>, __p=0x78a700,
__n=11) at
/opt/rh/devtoolset-2/root/usr/include/c++/4.8.2/bits/hashtable.h:794
std::allocator<rtl::OUString>, std::__detail::_Identity,
std::equal_to<rtl::OUString>, rtl::OUStringHash,
std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
std::__detail::_Prime_rehash_policy,
std::__detail::_Hashtable_traits<true, true, true> >::~_Hashtable (
    this=0x2aaab3166640 <XMLPropStyleContext::maParaSet>,
__in_chrg=<optimized out>) at
/opt/rh/devtoolset-2/root/usr/include/c++/4.8.2/bits/hashtable.h:959
rtl::OUStringHash, std::equal_to<rtl::OUString>,
std::allocator<rtl::OUString> >::~unordered_set (
    this=0x2aaab3166640 <XMLPropStyleContext::maParaSet>,
__in_chrg=<optimized out>) at
/opt/rh/devtoolset-2/root/usr/include/c++/4.8.2/bits/unordered_set.h:93
rtl::OUStringHash, std::equal_to<rtl::OUString>,
std::allocator<rtl::OUString> >::~unordered_set (
    this=0x2aaab3166640 <XMLPropStyleContext::maParaSet>,
__in_chrg=<optimized out>) at
/opt/rh/devtoolset-2/root/usr/include/c++/4.8.2/debug/unordered_set:113

Change-Id: Iff36d4f217b8bb07083d2e599afade1f86206165