3.38 schedule draft

[Michael Catanzaro <mcatanzaro gnome org>]

Hi,

I pushed a 3.38 schedule draft to the releng repo, and uploaded a test 
page here:

https://wiki.gnome.org/MichaelCatanzaro/ScheduleTest

I'll leave it to Andre to finalize as usual, but I wanted to start the 
schedule conversation this time because I wanted to propose releasing 
at the end of September (like we used to do) instead of mid-September. 
This syncs our schedule better with distro testing schedules and gives 
us more time to improve the quality of .0.

I've also run this by Iain to make sure it works for Ubuntu. Depending 
on Ubuntu's final release schedule, having .1 on October 10 might be 
problematic for them, so I moved it to October 3, which is earlier than 
we normally do. Let's treat this as an experiment and see how it goes.

The other noteworthy point is that I set the final release of the 3.34 
runtime to correspond with 3.37.90. I originally planned it to 
correspond with 3.38.1, but maintaining three different branches at 
once is annoying.

Comments welcome! Also, please sign up for releases. (I've assigned a 
couple that you normally request.)

Michael