chgserver: add fastannotate config section to sensitive list

Depending on the config value of `fastannotate.modes`, the fastannotate
extension can do different things in uisetup. Depending on value of
`fastannotate.server`, it can register new wireprotocol capabilities.

This fixes test-fastannotate-hg.t, test-fastannotate-protocol.t and
test-fastannotate.t with chg.

mercurial/chgserver.py

@@ -83,6 +83,7 b' def _hashlist(items):'
     b'eol',  # uses setconfig('eol', ...)
     b'extdiff',  # uisetup will register new commands
     b'extensions',
+    b'fastannotate',  # affects annotate command and adds fastannonate cmd
     b'schemes',  # extsetup will update global hg.schemes
 ]