hg: avoid relying on errno numbers / descriptions

A few tests hardcode errno numbers and/or descriptions in the output, causing
test failures on platforms where these values are different.

Differential Revision: https://phab.mercurial-scm.org/D362

tests/test-acl.t

@@ -883,7 +883,7 b' file specified by acl.config does not ex'
   added 3 changesets with 3 changes to 3 files
   calling hook pretxnchangegroup.acl: hgext.acl.hook
   acl: checking access for user "barney"
-  error: pretxnchangegroup.acl hook raised an exception: [Errno 2] No such file or directory: '../acl.config'
+  error: pretxnchangegroup.acl hook raised an exception: [Errno *] * (glob)
   bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!

tests/test-tags.t

@@ -381,7 +381,7 b' Errors writing to .hgtags fnodes cache a'
 
   $ hg blackbox -l 6
   1970/01/01 00:00:00 bob @b968051b5cf3f624b771779c6d5f84f1d4c3fb5d (5000)> tags
-  1970/01/01 00:00:00 bob @b968051b5cf3f624b771779c6d5f84f1d4c3fb5d (5000)> couldn't write cache/hgtagsfnodes1: [Errno 13] Permission denied: '$TESTTMP/t2/.hg/cache/hgtagsfnodes1'
+  1970/01/01 00:00:00 bob @b968051b5cf3f624b771779c6d5f84f1d4c3fb5d (5000)> couldn't write cache/hgtagsfnodes1: [Errno *] * (glob)
   1970/01/01 00:00:00 bob @b968051b5cf3f624b771779c6d5f84f1d4c3fb5d (5000)> 2/3 cache hits/lookups in * seconds (glob)
   1970/01/01 00:00:00 bob @b968051b5cf3f624b771779c6d5f84f1d4c3fb5d (5000)> writing .hg/cache/tags2-visible with 1 tags
   1970/01/01 00:00:00 bob @b968051b5cf3f624b771779c6d5f84f1d4c3fb5d (5000)> tags exited 0 after * seconds (glob)