fix(shell): add missing librocksdb.so.8 while packing tools and fix errors while launching shell

Fix some problems while launching shell by /path/to/tools/run.sh shell ... on production environment:

src/shell/config.ini could not be found since run.sh was executed with absolute path rather than relative path
pegasus_shell binary could not be found for the packaged directory by pack_tools which tends to used on production environment
packaged libraries such as libdsn_replica_server.so could not be found since the directory of libraries are missing in LD_LIBRARY_PATH
while loading shared libraries librocksdb.so.8 was not found which has not be packaged into tools

apache / incubator-pegasus