verify: clarify misleading fncache message

This is a message about cache corruption, not repository corruption or
actually missing files. Fix message and reduce to a warning.

mercurial/verify.py

@@ -244,7 +244,7 b' def _verify(repo):'
             try:
                 storefiles.remove(ff)
             except KeyError:
-                err(lr, _("missing revlog!"), ff)
+                warn(_(" warning: revlog '%s' not in fncache!") % ff)
 
         checklog(fl, f, lr)
         seen = {}

tests/test-fncache.t

@@ -48,13 +48,11 b' Testing verify:'
   checking manifests
   crosschecking files in changesets and manifests
   checking files
-   data/a.i@0: missing revlog!
-   data/a.i.hg/c.i@2: missing revlog!
-   data/a.i/b.i@1: missing revlog!
+   warning: revlog 'data/a.i' not in fncache!
+   warning: revlog 'data/a.i.hg/c.i' not in fncache!
+   warning: revlog 'data/a.i/b.i' not in fncache!
   3 files, 3 changesets, 3 total revisions
-  3 integrity errors encountered!
-  (first damaged changeset appears to be 0)
-  [1]
+  3 warnings encountered!
   $ cd ..
 
 Non store repo:

tests/test-verify.t

@@ -44,17 +44,18 b' introduce some bugs in repo'
   checking manifests
   crosschecking files in changesets and manifests
   checking files
-   data/FOO.txt.i@0: missing revlog!
+   warning: revlog 'data/FOO.txt.i' not in fncache!
    0: empty or missing FOO.txt
    FOO.txt@0: f62022d3d590 in manifests not found
-   data/QUICK.txt.i@0: missing revlog!
+   warning: revlog 'data/QUICK.txt.i' not in fncache!
    0: empty or missing QUICK.txt
    QUICK.txt@0: 88b857db8eba in manifests not found
-   data/bar.txt.i@0: missing revlog!
+   warning: revlog 'data/bar.txt.i' not in fncache!
    0: empty or missing bar.txt
    bar.txt@0: 256559129457 in manifests not found
   3 files, 1 changesets, 0 total revisions
-  9 integrity errors encountered!
+  3 warnings encountered!
+  6 integrity errors encountered!
   (first damaged changeset appears to be 0)
   [1]