Add 'PERSIST: False' entry to default device.conf

Add default value to newly created device.conf file.

Signed-off-by: Mark Harvey <markh794@gmail.com>
SMC: Persist library configuration across restart

Persist library config across restarts.
Append a .persist extention to the library_contents.XX
Attempt to read from the library_contents.XX.persist. If the file
does not exist, read the standard library_contents.XX

Ability to turn off (in device.conf)

Library: 10 CHANNEL: 00 TARGET: 00 LUN: 00
 Vendor identification: ADIC
 Product identification: Scalar i500
 Unit serial number: A0C0045421_LLB
 Product revision level: 621G
 NAA: 00:00:00:00:00:00:00:00
 PERSIST: yes

PERSIST: Will accept a 'yes | no' or 'true | false'
 - Actually anything other than 'yes' or 'true' will result in disabling
this feature

Signed-off-by: Mark Harvey <markh794@gmail.com>
man: Update man page for PERSIST: setting in device.conf

Document changes to allow persistent library_contents file across
restarts.

Signed-off-by: Mark Harvey <markh794@gmail.com>