2.6.4-rc5

[#6696]: Make services start/stop in the foreground instead of using monit
[#6689]: Fix an issue regarding enabling/disabling of external authentication
[#6677]: Improve the generation of unique home directories based on the login name from any authentication source
[#6629]: Relax the login character constraints to prevent issues with external authentication and sanitize the home directory we create from it
[#6613]: Fix an issue regarding external authentication where the first login always fails