misc: feature tracking markdown improvements
misc: feature tracking markdown improvements

Add table of contents to markdown file.
Added --exclude and --include options to user select which
fts fields to include in report.
Sort output based on feature name.

E.g.: ./build-root/scripts/fts.py --all --markdown --exclude="maintainer"

Type: make
Change-Id: I3edf8c2188a9f3e312767bbe12d75cca7d8c5b39
Signed-off-by: Ole Troan <aeed71d78dc09e4764ceac69b111eee9b50cfdd0@cisco.com>

FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp