Fully obey ./configure --prefix flag
Fully obey ./configure --prefix flag

Tests are currently hardcoded to be installed in /usr/share, even when
--prefix is not /usr. Fix the installation by using the autotools
$(datarootdir) variable; it defaults to /usr/share and obeys
./configure --prefix.

Signed-off-by: Bjørn Forsman <b4989a92a1eaaefdc797a00ca6fb021311d31f4f@gmail.com>

hallyn/cgmanager,hallyn/cgmanager,lxc/cgmanager,udeved/cgmanager,hallyn/cgmanager-pkg-ubuntu,hallyn/cgmanager-pkg-ubuntu,udeved/cgmanager,lxc/cgmanager