Description: This object indicates the  allocated bandwidth (BW) to each 
Virtual Concatenation Group (VCG).
Each nibble indicates BW percentage, in 12.5% steps, 
assigned to a group. 
For FCD-155, there may be 4 or 8 VCGs. When only 4 VCG exists,
    only two octets are used.
In current GFP Mux,one VCG is identified as primary group  
by vcGfpMuxConfPrimeGroup.
    Other VCGs may be secondaries.
    VCG with allocated BW value of zero does not belong to the GFPmux
    defined by GFP Mux number.
             ----------------------------------------
            |     Octet 0       |     Octet 1       |  
        |Nibble 4 | Nibble 3| Nibble 2| Nibble 1|
      MSB   | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | 
                    +-------------------+-------------------+
              VCG1        VCG2     VCG 3    VCG4
             ----------------------------------------
            |     Octet 3       |     Octet 4       |  
        |Nibble 4 | Nibble 3| Nibble 2| Nibble 1|
            | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | LSB
                    +-------------------+-------------------+
              VCG5        VCG6     VCG 7    VCG8
  Nibble value - BW Percentage
  (0...7)         (0 ...87.5%) 
 1   0001            12.5 %
 2   0010                25%
     3   0011            37.5
     .....
     7   0111            87.5%
     at least one nibble must be greater that zero. 
     Sum of alloacted BW must be 100%.
     Primary VCG BW must be greater than zero.