upspin: give pretty name to packing EEIntegrity pack
upspin: give pretty name to packing EEIntegrity pack

$ upspin info joe@foo.com/Access

Before:
    packing:      packing(22)

After:
    packing:      eeintegrity

Change-Id: Ic28b9d8a24aa5d1c4023ccbdb50e5de2dc908d23
Reviewed-on: https://upspin-review.googlesource.com/6844
Reviewed-by: Eric Grosse <f6ae9ca1078fda92fd7c2c20411c29bc6711159e@google.com>
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@google.com>

upspin/upspin,upspin/upspin