Fix fila10g_mode=?

[wehimwich]

An obscure feature of this command, the ? monitor form is not quite right. For any command, the ? form returns what was commanded, as opposed to the actual settings of the device. For this command, if the sample rate was commanded, the ? monitor form shows decimation and implied sample rate. It should show just the sample rate commanded.

To fix this the fila10g_mode_cmd structure will need to be expanded. To make that change it will have to moved in shared memory (fscom.h) from its current location and placed at the end. A substitute of the same size as the old structure will need to be placed in the old location to protect users (notably telegraf) that have pinned a FS 10.1 shared memory lay-out.

These steps should do the trick:

• In include/fila10g_mode_ds.h, rename the current fila10g_mode_cmd structure to fila10g_mode_cmd_old
• In the same file, add a new structure fila10g_mode_cmd with the same contents as the old one, but with a new substructure samplerate, like what is in include/dbbc3_core3h_modex_ds.h.
• In include/fscom.h, rename the existing fila10g_mode substructure to fila10g_mode_old, as an instance of fila10g_mode_cmd_old (i.e., add _old to both the type and instance names).
• In the same file, add a new fila10g_mode substructure at the end of the main structure as an instance of fila10g_mode_cmd (i.e., the previous definition before it changed).
• In clib/fila10g_mode_util.c, for functions fila10g_mode_dec(), fila10g_mode_enc(), vsi_samplerate_2_fila10g(), and fila10g_2_vsi_samplerate() make changes to parallel the use of samplerate in file clib/dbbc3_core3h_modex_util.c, for functions dbbc3_core3h_modex_dec(), dbbc3_core3h_modex_enc(), vsi_samplerate_2_dbbc3_core3h(), and dbbc3_core3h_2_vsi_samplerate().

If I didn't miss anything: Bob's your uncle.