[Pulp-list] package directory structure revamped

[Pradeep Kilambi]

I changed our central package storage structure from

/var/lib/pulp/packages/$hash/$name/$ver/$rel/$arch/filename.rpm

to

/var/lib/pulp/packages/$name/$ver/$rel/$arch/$hash/filename.rpm

This should make our lives easier to lookup packages by name easily. 
There is also a corresponding grinder change with this. I tagged 
grinder, should be in next build. Make sure to git pull grinder and 
pulp. The next time you sync, the data should be written with this new 
structure.

For cleanup purposes, rm -rf /varlib/pulp/packages/* 
/varlib/pulp/repos/* and resync your repos.

Lemme know if you see any issues,

~ Prad