Security update for prosody (moderate)

This update for prosody to version 0.10.2 fixes the following issues:

This security issue was fixed:

• CVE-2018-10847: Prevent insufficient validation of client-provided
  parameters during XMPP stream restarts. Authenticated users may have
  overriden the realm associated with their session, potentially bypassing
  security policies and allowing impersonation (bsc#1094890).

These non-security issues were fixed:

• mod_websocket: Store the request object on the session for use by other
  modules
• mod_c2s: Avoid concatenating potential nil value
• core.certmanager: Allow all non-whitespace in service name
• mod_disco: Skip code specific to disco on user accounts
• mod_bosh: Store the normalized hostname on session
• MUC: Fix error logged when no persistent rooms present