Create ability to reference the hardware manufacturer as an exec variable

[ndejong]

We currently have the following interpolated variables that can be referenced in the --exec

• {IP}=ipv4-address
• {HW}=hardware-address
• {TS}=timestamp-utc
• {ts}=timestamp-utc-short

Need another variable that allows user to obtain the hardware-manufacturer details

Refer to ticket #2