Stand-alone tests without Log VOL

[wkliao]

In order to check whether an error was caused by Log VOL or other VOLs, this PR allows one to run test programs in tests/basic without Log VOL. For instance, run command below to build all executables, with configuring Log VOL first.

export HDF5_DIR=${HOME}/HDF5
export LD_LIBRARY_PATH=${HDF5_DIR}/lib:${LD_LIBRARY_PATH}
make -f makefile.alone MPICXX=${HOME}/MPICH/bin/mpicxx

Once the executable were built, one can test any VOL or any combination of VOLs by setting the VOL specific environment variables. For example, to run all test programs with Cache and Async VOLs enabled, use commands below.

export ABT_DIR=${HOME}/Argobots
export ASYNC_DIR=${HOME}/Async
export CACHE_DIR=${HOME}/Cache
export HDF5_DIR=${HOME}/HDF5
export HDF5_ROOT=${HDF5_DIR}
export HDF5_PLUGIN_PATH=${CACHE_DIR}/lib:${ASYNC_DIR}/lib
export LD_LIBRARY_PATH=${CACHE_DIR}/lib:${ASYNC_DIR}/lib:${ABT_DIR}/lib:${HDF5_DIR}/lib:${LD_LIBRARY_PATH}
export HDF5_VOL_CONNECTOR="cache_ext config=./cache.cfg;under_vol=512;under_info={under_vol=0;under_info={}}"
export MPICH_MAX_THREAD_SAFETY=multiple
export HDF5_USE_FILE_LOCKING=FALSE
export HDF5_ASYNC_DISABLE_DSET_GET=0
make -f makefile.alone MPIEXEC=${HOME}/MPICH/bin/mpiexec ptest