Create VPD tool utility file

Changes:
Move the vpd-tool specific keywords to independent
resource file.

Tested:
Executed test_vpd_tool.robot on BMC environment.

Change-Id: Icc578f80c4de171339cb37e

Create VPD tool utility file

Changes:
Move the vpd-tool specific keywords to independent
resource file.

Tested:
Executed test_vpd_tool.robot on BMC environment.

Change-Id: Icc578f80c4de171339cb37e606daff334d1c8a21
Signed-off-by: Sridevi Ramesh <sridevra@in.ibm.com>

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