Added software upgrade documentation
Added basic software upgrade architecture
Added tests with failures
First move toward a system feature
Add 'show bootvar' parsing and software upgrade test
TFTP port number is an ats_file class variable now
Added software upgrade for ATS emulated
Improved tests
Command timeout is file size dependent
Removed needless load_system() calls
Removed needless load_config() calls
Changed 'reboot' in 'reload', lower timeout, removed needless load_system()
Removed old software upgrade references
Fixed .yaml and removed needless load_system() calls in awp file feature
Introduced awp software upgrade test and feature
Completed awp software upgrade command sequence
Improved timeouts and fixed reboot command for ats
Simplified image name management
Added timeout for AW+ devices
Fixed proxy timeout issue