Modify eSEL script to take input files with eSEL data

The eSEL.pl can now be run with different options.
The options are: get_ami_data - just fetch AMI eSEL
data into a binary file, don't do any processing;
decode_ami_data (takes a file) - parse AMI eSEL
binary file; get_and_decode_ami - does both of
the above; decode_obmc_data (takes a file) -
parses the OpenBmc eSEL file.

Change-Id: Ib226b6e12cff1ca805aed909ad647d33d1016ff3
RTC:166211
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/36896
Reviewed-by: Stephen M. Cprek <smcprek@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Andrew J. Geissler <andrewg@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: William G. Hoffa <wghoffa@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

Author: Ilya Smirnov