hdf5_ep

[svn-r18457] Purpose:
    Add test cases for bug1797 - h5repack doesn't handle references in 
    compound and vlen datatypes for attributes 

Description:
    Add test cases ahead as waiting for H5Acopy to complete the fix.
    1. obj references in attr of compound type
    2. region references in attr of compound type
    3. obj references in attr of vlen type
    4. region references in attr of vlen type

NOTE:
    This test is skipped now and will be included when code part is completed.
    ( H5Acopy() replaces copy_attr() )
    The file&code can be used for lib portion test.

Tested:
    jam, amani, linew