tools: pmempool utility

- pmempool utility with the following commands:
-- create - creating pool files
-- info - parsing pool files
-- dump - dumping data from pool files
-- check - checking and repairing pool files
- update scripts for creating packages
- bash completion script
- manual pages and README file
You have this function in common.c but I only see it called one place, during pmempool create. Why is this in common.c? Do you expect it will be used somewhere else?