Resolve "Accept-invites script doesn't join all rooms"

Closes #13 (closed)

Not all users were performing an initial sync in the join setup script, hence why users were not joining all rooms. This issue was fixed by correctly resetting the matrix user class state when the Locust user logins to the next user.

Changes:

• Fixed internal class state issues now that sync is working properly
• Disabled accept_invites action now that user joining in the setup script is working
• Removed rate-limiting of room joining on Synapse
• Improved error detection/handling for room creation and room joining