fix retrieval for serial, date and chemistry

Some dmidecode use 'SBDS foo' instead of 'foo' keys for those variables.
add the VMID and VMNAME keys
retrieve the LPAR ID
add VMNAME and syntax
move the BIOS code in AIX.pm

This will simplify the LPAR related code.
generate a fake serial number for LPAR

The host serial number is not in IOS/SSN anymore to avoid conflict.

closes: #950
import some lpartstat -i output sample
add VMNAME and VMHOSTSERIAL keys
various syntax fixes
Merge branch '2.2.x+lpar' into 2.3.x
changelog: add AIX LPAR support

closes: #952
closes: #950