narrow: mark wire proto capability names experimental and versioned

We already plan to add a "widen" wire protocol command to the "narrow"
capability, so let's version the capabilities as "exp-narrow-1" and
"exp-ellipses-1". When we add the "widen" command, we will then add a
"exp-narrow-2" capability to indicate support for that command.

Differential Revision: https://phab.mercurial-scm.org/D4529

hgext/narrow/narrowwirepeer.py

@@ -17,8 +17,8 b' from mercurial import ('
     wireprotov1server,
 )
 
-NARROWCAP = 'narrow'
-ELLIPSESCAP = 'ellipses'
+NARROWCAP = 'exp-narrow-1'
+ELLIPSESCAP = 'exp-ellipses-1'
 
 def uisetup():
     def peersetup(ui, peer):

tests/test-narrow-clone-non-narrow-server.t

@@ -33,7 +33,7 b' Verify that narrow is advertised in the '
   $ echo hello | hg -R . serve --stdio | \
   >   $PYTHON unquote.py | grep narrow
   narrow=v0
-  rev-branch-cache changegroupsubset getbundle known lookup narrow protocaps pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
+  rev-branch-cache changegroupsubset exp-narrow-1 getbundle known lookup protocaps pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
 
   $ cd ..