dreport: Added fwprintenv plugin

Plugin used for collecting primary flash U-boot
environment variables.

Resolves partially openbmc/openbmc#2862

Change-Id: I9cffd936575311a39d8006b84a612f0223158fbb

dreport: Added fwprintenv plugin

Plugin used for collecting primary flash U-boot
environment variables.

Resolves partially openbmc/openbmc#2862

Change-Id: I9cffd936575311a39d8006b84a612f0223158fbb
Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>

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