Generate tach based presence detect YAML

Create gen_presence_yaml.pl to find the FRUs that use
tach readings as their presence detects, and create
the YAML definition necessary for mapping the tach

Generate tach based presence detect YAML

Create gen_presence_yaml.pl to find the FRUs that use
tach readings as their presence detects, and create
the YAML definition necessary for mapping the tach
sensor readings to specific FRUs.

Change-Id: I3b3b1c4a32827b0efab2927353b0988880eaefa0
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

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