Fix LIBDIR for make install in checkinstall role.
Change CONFDIR to /etc in checkinstall role.
Modify checkinstallrc for CentOS.
Change CONFDIR to /etc in checkinstall.
Set INSTALLWATCH_PREFIX to /usr in checkinstall role.
Fix checkinstallrc path.
Add LD_PRELOAD when running checkinstall. During installation, installwatch.so
is deleted and installed again, so LD_PRELOAD in checkinstall script does not
work correctly.