FileStore: Conditional collection of drive metadata

FileStore: Conditional collection of drive metadata

get_device_by_uuid->blkid_find_dev_with_tag() call from
FileStore::collect_metadata() is hanging for ~3min before returning
EINVAL in case the drive is visible but reserved for some other host.
This is probably is bug within blkid* calls. fdisk/lsblk call is coming
out immediately saying device is inaccessible. This call is now
protected by config option filestore_collect_device_partition_information

Signed-off-by: Somnath Roy <somnath.roy@sandisk.com>