Circus

Fix packaging issue.

This release removes support for Python 2.7 & 3.4, and adds support for Tornado 5+.

- Improve resiliency of the Controller - 1142
- Add CI tests for Mac OS via Github Actions - 1137, 1141
- Fix encoding issue in the Watchdog plugin - 1136
- Change ConfigParser to RawConfigParser to avoid interpolation errors - 1133
- Drop support for tornado<5 and start using asyncio eventl loop - 1129, 1132
- Fix mem_info readings to be more reliable - 1128
- Drop support for Python 2.7 & 3.4 - 1126
- Speedup reloadconfig for large number of sockets - 1121
- Do not allow adding watchers with the same lowercase names - 1117
- Do not delete pid file during restart - 1116
- Fix graceful_timeout watcher config option type - 1115

Fix packaging issue.

This release removes support for Python 2.6 & 3.3, and adds official support
for Python 3.6, 3.7 & 3.8. It also adds support for PyZMQ 17+.

- Remove support for Python 2.6 & 3.3 - 1110
- Fix compatibility with PyZMQ 17+ - 1111
- Fix compatibility for Python 3.6, 3.7 & 3.8 - 1079, 1085, 1113
- Send add/remove events to plugins - 1086
- Allow 'use_papa' to be called programmatically - 1083
- Allow integer to be used for stop_signal in ini file - 1089
- Add 'on_demand' option to watchers - 1089
- Add before_reap and after_reap hooks - 1104

This release fixes several bugs and explicitely mark Circus as incompatible
with Tornado 5 & PyZMQ 17.

- Born Tornado version to < 5 & PyZMQ version to < 17 - 1030, 1064, 1055
- Fix 'papa_enpoint' config option - 1066
- Circusctl returns non-zero exit code when command fails - 1001
- Fix potential process leaking - 998
- Fix behavior when increasing numprocesses - 997
- Fix Watcher.reap_process - 1036
- Coerce 'max_retry' value to int - 1008
- Drop iowait from the requirements - 1003
- Doc updates - 1022, 1013

This release fixes several bugs and add new options to Circus sockets and watchers.
- Add stdin_socket option to the watcher - 975
- Add a blocking option to Circus sockets - 973
- Ignore errors when parsing the Pidfile - 866, 969
- Fixes for papa sockets - 930, 968
- Remove I/O operations on closed files - 979, 980
- Accept empty ini sections - 970
- Send SIGKILL to children recursively - 986
- Improve tests stability - 984
- Doc updates - 982, 983, 985