Merging changes on Extender/Carrier/WebProxy upgrade

Extender/Carrier/WebProxy configs are not migrated on upgrade.

In case of manual changes in the extra component .toml files,

• After upgrade, download new .toml files from PrivX UI
• Compare between previous version of *.toml files and downloaded files
  • If there are no new variables introduced to the downloaded files, discard the downloaded files
  • If there are new variables, merge the manual changes from your .toml to the new .toml files
• Run postinstall scripts of the components