Improve detection of when the ssh process exits in both daemon and
foreground modes. Previously, sshuttle could infinite loop with 100%
cpu usage if the ssh process died. On machines that use suspend, the
ssh connection might not resume after wakeup. Now, this situation is
detected and sshuttle exits. The fix involves changing the return
value we check for when we call poll() and using a psutil function to
detect when the process exits if we are running sshuttle as a daemon.

Fix python2 server compatibility

Python2 ignores the byte string qualification (b’foo’)  but falls over for the combination rb for this regexp. Switching the qualification to br appears to fix this and works in both python2 and python3.

Fixed typo.

Fixes  #469. We replace python3 exclusive code with a check for python3 and a compatibility fix. Note that the switch from os.set_nonblocking to fcntl.fcntl in 98d052d1 (fixing #503) also fixes python2 compatibility.

Change license text to LGPL-2.1

Bump attrs from 19.3.0 to 20.1.0

Bumps [attrs](https://github.com/python-attrs/attrs) from 19.3.0 to 20.1.0.
- [Release notes](https://github.com/python-attrs/attrs/releases)
- [Changelog](https://github.com/python-attrs/attrs/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/python-attrs/attrs/compare/19.3.0...20.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

allow Mux() flush/fill to work with python < 3.5

Bump pytest-cov from 2.10.0 to 2.10.1

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.10.0 to 2.10.1.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-cov/compare/v2.10.0...v2.10.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fixes: #503

Fix parse_hostport to always return string for host

This fixes #488 and provides an alternative solution for #489.

Add missing package in OpenWRT documentation

fix: require -r/--remote

This reverts commit 5debf1f1.

The package 'iptables-mod-extra' also needs to be installed

* Can't use this option twice, separate by comma actually.

* Broke the line because it was too long.

Bump pytest from 6.0.0 to 6.0.1

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.0.0 to 6.0.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/6.0.0...6.0.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump pytest from 5.4.3 to 6.0.0

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.4.3 to 6.0.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/5.4.3...6.0.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

README: add Ubuntu

Douglas Adams and Deep Thought was wrong, 42 is not the answer

Fix formatting in installation.rst

Fix formatting typos in usage docs

Add missing import