Expand ProgramType enumeration

Expand ProgramType enumeration

The ProgramType values volumeUtility and salvager are overloaded. Expand
the ProgramType enum to include more specific program types, and adjust
conditionals to match.

Also, instead of determining all behavior by checking programType, add
some flags to be passed in to VInitVolumePackage to determine e.g.
whether or not we can use the FSSYNC channel. This makes it easier to
see the intent of some conditionals, and reduces the number of times a
caller must lie about what program it is.

Change-Id: Ic9852a35bb16a6b1f4b0aa9766de63178ecea56f
Reviewed-on: http://gerrit.openafs.org/786
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>