metric-ipmi-blobs: adding tmpfs

Adding tmpfs metric coverage to pre-ttf machines

Tested:
```
df -h
Filesystem                Size      Used Available Use% Mounted on
dev                     468.9M         0    468.9M   0% /dev
tmpfs                   469.9M     12.6M    457.3M   3% /run
/dev/mtdblock4           20.6M     20.6M         0 100% /run/initramfs/ro
/dev/mtdblock6            3.0M    436.0K      2.6M  14% /run/initramfs/rw
cow                       3.0M    436.0K      2.6M  14% /
tmpfs                   469.9M      8.0K    469.9M   0% /dev/shm
tmpfs                   469.9M         0    469.9M   0% /tmp
tmpfs                   469.9M     40.0K    469.8M   0% /var/volatile
tmpfs                   469.9M     12.6M    457.3M   3% /var/lib/systemd/coredump
```

Change-Id: I50c763707268252ed51a903d8b7e02543dab6166
Signed-off-by: Abby <buchmana@google.com>
2 files changed