vpnor: Catch ReasonedError in vpnor_copy_bootloader_partition

It was observed that mboxd cored on systems that didn't have a virtual
PNOR deployed:

```
May 09 10:53:48 witherspoon systemd[1]: Start

vpnor: Catch ReasonedError in vpnor_copy_bootloader_partition

It was observed that mboxd cored on systems that didn't have a virtual
PNOR deployed:

```
May 09 10:53:48 witherspoon systemd[1]: Starting Updates symlinks for active PNOR version...
May 09 10:53:49 witherspoon obmc-flash-bios[1238]: ls: /media/pnor-ro-*: No such file or directory
May 09 10:53:49 witherspoon systemd[1]: Started Updates symlinks for active PNOR version.
May 09 10:53:49 witherspoon systemd[1]: Started Phosphor MBOX Daemon.
May 09 10:53:51 witherspoon mboxd[1242]: terminate called after throwing an instance of 'openpower::virtual_pnor::UnknownPartition'
May 09 10:53:51 witherspoon mboxd[1242]: what(): Partition HBB is not listed in the table of contents
May 09 10:53:51 witherspoon systemd[1]: Created slice system-systemd\x2dcoredump.slice.
May 09 10:53:51 witherspoon systemd[1]: Started Process Core Dump (PID 1243/UID 0).
May 09 10:53:51 witherspoon phosphor-host-state-manager[1237]: Initial Host State will be Off
May 09 10:53:51 witherspoon phosphor-host-state-manager[1237]: External request to reset reboot count
May 09 10:53:51 witherspoon systemd[1]: Started Phosphor Host State Manager.
May 09 10:53:51 witherspoon systemd[1]: Started Witherspoon UART render controller.
May 09 10:53:53 witherspoon systemd[1]: Started Wait for /xyz/openbmc_project/state/host0.
May 09 10:53:53 witherspoon systemd[1]: Starting Reset host sensors...
May 09 10:53:53 witherspoon systemd[1]: Starting Reboot If Enabled...
May 09 10:53:53 witherspoon systemd[1]: Starting Phosphor Time Manager daemon...
May 09 10:53:55 witherspoon systemd[1]: mboxd.service: Main process exited, code=dumped, status=6/ABRT
May 09 10:53:56 witherspoon systemd[1]: mboxd.service: Unit entered failed state.
May 09 10:53:56 witherspoon systemd[1]: mboxd.service: Failed with result 'core-dump'.
```

The ToC parsing and partition lookup functions can throw a variety of
exceptions, though the ones we care about are all derived from
ReasonedError. Catch ReasonedError to avoid core-dumping mboxd when it is
launched without a virtual PNOR available or symlinks in place th point it to
the virtual PNOR root directory.

Further, explicitly ignore the failure in the start-up path. This keeps
mboxd alive, which will recover on receiving a RESET if the appropriate
images and symlinks have been put in place.

Change-Id: I1f753d1944d29499e360cbdf5a27a3531f37eed6
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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vpnor: Configure a handler table in init_vpnor()

Currently the table just mirrors that which is set by the regular
implementation, however getting to that point requires massaging the
code a little.

vpnor: Configure a handler table in init_vpnor()

Currently the table just mirrors that which is set by the regular
implementation, however getting to that point requires massaging the
code a little. Thus, separate out this change from one that changes the
behaviour of the commands to improve the readability of the latter
change.

Change-Id: I4007a8a4d508c6d850b8cc878bab8f72bd343498
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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vpnor: Isolate relevant code in vpnor directory

This is prepatory work for introducing more vpnor-specific behaviours to
window handling. We will be introducing more objects to link, in order
to hoo

vpnor: Isolate relevant code in vpnor directory

This is prepatory work for introducing more vpnor-specific behaviours to
window handling. We will be introducing more objects to link, in order
to hook some of the window command handlers.

This change takes the opportunity to revert back to the upstream names
for some of the original C files.

Change-Id: I6b67ae466a2695054035e65ba752881be9c32d1a
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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