Add changes to upload port information from fea stitch to cp fea.
Read the port information from the system in fea stitch and forward it to fea.

Also, add persistence to the fea-stitch slot number to uid mapping by
storing it in a file that the cp fea will manage.
Similarly, also store the port num to interface names in a file for persistence.
This file will be maanged by fea-stitch.

Lastly, fea stitch will also store its uid in a file for persistence.
Merge branch 'master' of github.com:asridharan/StitchNetOS
Fix build error by checking in a missing change in fea_stitch_store.hh
Ignore the ifindex for interfaces in CP-FEA since this needs to be a unique number.
Just setting it to 0 for now.
Each of the Stitch-FEA will have the correct ifindex of the interface it owns.
Do not push loopback interfaces upto the LC-FEA from the Stitch-FEA
Fixed netstat command instruction
Added the show interfaces stitch command
Merge branch 'lc-port-mirror' of github.com:asridharan/StitchNetOS-xorp into port_mirror
Disabled logging on the show interfaces stitch command. Also formatted the output
Adding private members to FeaStitchInst for better access control.