Do not chmod +s chvt: instead, rely on sudo

The SUID flag may be lost on update, and relying on sudo is
slightly more secure.

We create a file in /etc/sudoers.d/ : these files are sourced by
default since sudo 1.7.2p1-1 (Ubuntu 10.04 lucid, Debian squeeze).

Fixes #723.
unity: add support for utopic
unity: change whitelists to blacklists
mount-chroot: Use read -r instead of read

read treats ending \ as an escape character, preventing passwords
ending in \. Use `read -r` (POSIX!)

We probably don't want to support multi-line passwords, but
passwords ending in \ seem to be a nice thing to have.

Fixes #1158.
mount-chroot: Remove unecessary ecryptfs options

- `no_sig_cache` is normally interpreted by the mount helper
  (`mount.ecryptfs`), but we use `-i` in the `mount` command, so
  the helper never gets called. (the man page is incorrect, it's
  not a kernel option) So we can just remove it.
- `ecryptfs_passthrough` does not take a `=y/n` parameter. Either
  you set it (`ecryptfs_passthrough`), or you don't (in that case
  the default behaviour is `=n` as intended). I checked Chromium
  kernel sources 3.4 to 3.14, same behaviour on all of them.
  Tested on a 3.8 machine: I removed the option, dropped a file
  in, it appears, but cat-ing the file results in input-output
  error.

Removes spurious dmesg errors, fixes #1122.
Replace all read by read -r

It is not always necessary, but avoids potential weirdness.
utopic: re-whitelist systemd for saucy and trusty
Merge pull request #1155 from drinkcat/crouton-autotest

daemon.sh: various fixes.
Merge pull request #1159 from drinkcat/multiline-pwd

ecryptfs fixes
Merge pull request #1132 from smibarber/unity-utopic

unity: add support for utopic
*/releases: Specify if a release should be tested or not

Each release line is now in the following format:
`release[*][|other,key,words]`

 - * indicates that the release is unsupported
 - keywords are comma-separated, and can currently be `test` or
   `notest`. Default is for supported releases to be tested (can
   be overridden with `notest`), and unsupported ones not to be
   tested (can be overridden with `test`).
installer: Fix accidental prefix match.
enter-chroot: Remap devbroker-access group.

Enables security key users to add themselves to the group, and/or
add custom udev rules.
Merge pull request #1177 from drinkcat/remap-devbroker-access

enter-chroot: Remap devbroker-access group.
Merge pull request #1140 from drinkcat/releases-flags

*/releases: Specify if a release should be tested or not
Merge pull request #727 from drinkcat/sudo-chvt

Do not chmod +s chvt: instead, rely on sudo
daemon.sh: Increase run time back to 24 hours.