During the build process, the following are moved to /usr/share/tails:
  - /usr/share/i2p
  - /usr/sbin/wrapper to /usr/share/tails/i2p
  - /usr/share/applications/i2p.desktop to /usr/share/tails/i2p

The I2P binaries are changed to be owned by i2psvc:i2psvc to prevent it
being run from the new location under /usr/share/tails/i2p.

If the string 'i2p' is entered on at the boot prompt, these files are
returned to ther original locations, making I2P accessible. Also, the
I2P sudoers file is written to the system, allowing the amnesia user to
run tails-start-i2p as the i2psvc user.