HO: cfg: separate hodec1 from hodec2 parameters

Do not share config items between the current handover decision and the
upcoming handover_decision_2.

Rename current handover config items to hodec2_* and duplicate the ones
relevant to handover decision algorithm 1 with name prefix of hodec1_*.

I considered moving hodec2 parameters to an entirely separate .c file and
struct, but that causes considerable code bloat. Rather use the nice
handover_cfg net/bts level mechanism as-is, and simply prefix the names.

In the VTY, the hodec1 parameters are configurable by 'handover foo 23'
commands, while the hodec2 parameters are by 'handover2 foo 23'. The generic
VTY commands to enable/disable handover and to choose the algorithm are still
'handover (0|1)' and 'handover algorithm (1|2)'.

(Note, a subsequent commit will rename the 'handover foo' for hodec1 to
'handover1 foo' and add backwards-compat aliases.)

For example, the 'window rxlev averaging 5' command now exists both for
handover decision 1 and handover decision 2, and its values are independent.
This is valid config:

    network
     # set up handover decision algorithm 1
     # (pending rename of these items to 'handover1 ...')
     handover window rxlev averaging 5
     handover window rxlev neighbor averaging 5

     # set up handover decision algorithm 2
     handover2 window rxlev averaging 7
     handover2 window rxlev neighbor averaging 7
     handover2 penalty-time max-distance 10

     # enable handover
     handover 1

     bts 0
      handover algorithm 1
     bts 1
      handover algorithm 2

In this example, bts 0 uses algo 1 with rxlev averaging of 5, while bts 1 uses
algorithm 2 where rxlev averaging of 7 is in effect.

Change-Id: I6475b2543b18d21710a6d774b214cb484f36ec8e

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