Create dumps for a library with multiple tags

create_reference_dumps.py loads tags and paths from lsdump_paths.txt.
It used to create a dump for each (lib, arch) tuple. Now a dump may
have multiple tags. The script creates a dump for each
(lib, arch, tag).

Test: ./create_reference_dumps.py -products aosp_x86_64 \
      -release next
Bug: 314010764
Change-Id: I105b53bf4519e37493b94d0d938df398f259354f