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o Adds a reinstall backend call
o Moves pkg_upgrade.sh into its own dir
o Don't clobber progress output when action is running
o Rename action to clearly reflect it's purpose
o Tweak EOL message a bit more

This is a test of how far we can go with our backend restructuring
without glitching firmware update temporarily.

(cherry picked from commit a5c4d51d)

(cherry picked from commit 8ee922f6)

FTP proxy via squid proxy server is available if needed.

(cherry picked from commit 54c22d2c)