Add process restart check

This sensu check is used to check if a running process requires a
restart if a library/package has been changed. This is useful you auto
upgrade pacakages and need to know which services need to be restarted
as a result of the upgrade. The default is to Warn if a single process
needs to be restarted and Critical if 2 or more processes need to be restarted.

The implementation of this check makes it Debian specific and will not work on
distributions/OS. It also requires passworless sudo for the Sensu user.
Merge pull request #920 from mattyjones/master

Add headers
Stop using deprecated method in File

Changed File.exists? to File.exist? method
Merge pull request #923 from yasn77/add_process_restart_check

Add process restart check
Exclude system reboots which have been completed.  No clue why AWS returns completed events but I want to ignore them
Merge pull request #915 from johntdyer/master

Exclude system reboots which have been completed.
Update check-instance-events.rb
move all spec and fixtures to /spec
change location od check-dns for spec file

add headers
fix typo in test
Fixed typo in new location
fix path
Merge pull request #931 from mattyjones/move_spec_files

move all spec and fixtures to /spec
Add headers