Move power errors to org.open_power.witherspoon

Move xyz.openbmc_project.Power to org.open_power.Witherspoon.
This repo is Witherspoon specific, so moving to specific tree to have
its own namespace. Update generated file, and corresponding namespace
statements in the source files.

Change-Id: I10bd1eeeac5b5f391ca54bf361b249b7ad531852
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
diff --git a/.gitignore b/.gitignore
index 0aa8e6b..77b0c3e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,5 +27,5 @@
 stamp-h1
 witherspoon-pseq-monitor
 witherspoon-psu-monitor
-xyz/openbmc_project/Power/Fault/
+org/open_power/Witherspoon/Fault/
 test-driver