hg: copy [hostsecurity] options to remote ui instances (issue5305)

TIL that ui instances for remote/peer repos don't automagically inherit
config options from .hg/hgrc files.

This patch makes remote ui instances inherit options from the
[hostsecurity] section. We were already inheriting options
from [hostfingerprints] and [auth]. So adding [hostsecurity] to the
list seems appropriate.

mercurial/hg.py

@@ -923,7 +923,7 b' def remoteui(src, opts):'
         dst.setconfig('bundle', 'mainreporoot', r, 'copied')
 
     # copy selected local settings to the remote ui
-    for sect in ('auth', 'hostfingerprints', 'http_proxy'):
+    for sect in ('auth', 'hostfingerprints', 'hostsecurity', 'http_proxy'):
         for key, val in src.configitems(sect):
             dst.setconfig(sect, key, val, 'copied')
     v = src.config('web', 'cacerts')

tests/test-https.t

@@ -501,6 +501,17 b' The per-host config option by itself wor'
   abort: error: *unsupported protocol* (glob)
   [255]
 
+.hg/hgrc file [hostsecurity] settings are applied to remote ui instances (issue5305)
+
+  $ cat >> copy-pull/.hg/hgrc << EOF
+  > [hostsecurity]
+  > localhost:minimumprotocol=tls1.2
+  > EOF
+  $ P="$CERTSDIR" hg -R copy-pull id https://localhost:$HGPORT/
+  (could not negotiate a common protocol; see https://mercurial-scm.org/wiki/SecureConnections for how to configure Mercurial to avoid this error)
+  abort: error: [SSL: UNSUPPORTED_PROTOCOL] unsupported protocol (_ssl.c:590)
+  [255]
+
   $ killdaemons.py hg0.pid
   $ killdaemons.py hg1.pid
   $ killdaemons.py hg2.pid