Change CHAP secret default length

Some of the iSCSI initiators have a limit regarding the maximum
CHAP secret length. For example, the MS iSCSI Initiator
does not allow CHAP secrets longer than 16 characters, smaller
than the actual default 20 characters length.

This patch simply changes the default length to 16 characters,
value which is already used by default by some of the volume
drivers. In fact, the iSCSI specs state that: "Implementations
MUST support use of up to 128 bit random CHAP secrets".

Change-Id: I0295fabd0c0048c93e1f452077d0f5d19af9784d
Closes-Bug: #1392792
PureISCSIDriver needs to disconnect hosts before deleting volumes.

Some error conditions can cause a situation where the volume is
“connected” to a Purity host, but the volume failed to attach on the
initiator side. If we then try to delete this volume it will cause
errors and leave orphaned volumes behind on the Flash Array.

The solution is to check for any connections and then remove them prior
to making a call to delete the volume.

Closes-Bug: 1388260
Change-Id: I8f5b3b28900d79228fd91f2ad53535224f263657
Implementing the use of _L’x’/i18n markers

Placing the _Lx markers back into the code. No other cleaner solution has
has been implemented. Patches will be submitted in a series of sub
directories and in a fashion that is manageable.
This is the fourth commit of this kind

Change-Id: Ibbef7f06a391e9e6efca082d45caecdf60a9e811
Partial-Bug: #1384312
Merge "Change CHAP secret default length"
Merge "Implementing the use of _L’x’/i18n markers"
Merge "PureISCSIDriver needs to disconnect hosts before deleting volumes."