* Remove unused Vagrant scripts

* Change package Architecture to any

* Preinstall the wheel package when building venvs.

Addresses the following warnings during Debian builds:

    Using legacy 'setup.py install' for jaeger-client, since package 'wheel' is not installed.
    Using legacy 'setup.py install' for matrix-synapse-ldap3, since package 'wheel' is not installed.
    Using legacy 'setup.py install' for opentracing, since package 'wheel' is not installed.
    Using legacy 'setup.py install' for psycopg2, since package 'wheel' is not installed.
    Using legacy 'setup.py install' for systemd-python, since package 'wheel' is not installed.
    Using legacy 'setup.py install' for pympler, since package 'wheel' is not installed.
    Using legacy 'setup.py install' for threadloop, since package 'wheel' is not installed.
    Using legacy 'setup.py install' for thrift, since package 'wheel' is not installed.

* Allow /etc/default/matrix-synapse to be missing

Per the systemd.exec manpage, prefixing an EnvironmentFile with "-":

> indicates that if the file does not exist, it will not be read and no
> error or warning message is logged.

Signed-off-by: Dan Callahan <danc@element.io>

Fixes a problem where `impish` packages could not be processed by `reprepro`.

Signed-off-by: Dan Callahan <danc@element.io>

Use $(...) notation instead of legacy backticked `...`.

https://github.com/koalaman/shellcheck/wiki/SC2006



Signed-off-by: Dan Callahan <danc@element.io>

Double quote to prevent globbing and word splitting.

https://github.com/koalaman/shellcheck/wiki/SC2086



Signed-off-by: Dan Callahan <danc@element.io>

Use find instead of ls to better handle non-alphanumeric filenames.

https://github.com/koalaman/shellcheck/wiki/SC2012



Signed-off-by: Dan Callahan <danc@element.io>

Expressions don't expand in single quotes, use double quotes for that.

https://github.com/koalaman/shellcheck/wiki/SC2016



This specifically warned about the '$aregis...' part of the sed script.
Which is a relatively obscure use of sed.

Splitting this into two commands makes its intent more obvious and
avoids contravening Shellcheck's lints.

Signed-off-by: Dan Callahan <danc@element.io>

Not following: (error message here)

https://github.com/koalaman/shellcheck/wiki/SC1091



Signed-off-by: Dan Callahan <danc@element.io>

Use single quotes, otherwise this expands now rather than when signalled.

https://github.com/koalaman/shellcheck/wiki/SC2064



Signed-off-by: Dan Callahan <danc@element.io>

Quote this to prevent word splitting

https://www.shellcheck.net/wiki/SC2046



Signed-off-by: Dan Callahan <danc@element.io>

Signed-off-by: Nick Barrett <nick@beeper.com>

Replace the outdated list of dpkg triggers with an autogenerated one.