Put PDB files in symbol server format
Put PDB files in symbol server format

This change modifies the etwsymbols.zip file so that the PDBs are laid
out in symbol-server compatible GUID/age format. This means that they
can just be unzipped into a local symbol server cache directory, for
easy loading by windbg, VS, WPA, or any other tool that can handle
symbol servers.

ariccio/UIforETW,google/UIforETW,ariccio/UIforETW,google/UIforETW,ariccio/UIforETW,google/UIforETW,google/UIforETW,ariccio/UIforETW