tests: fix test-run-tests.py on OS X

Do the same hack as in test-doctests.py to let the test pass on OS X.

--HG--
extra : rebase_source : a136be0b8ae9cf2ceef24785f1daf10bca9679ad
revset: narrow scope of the variable referred only in specific code path

This patch narrows scope of the variable "m" in the function for
revset predicate "contains()", because it is referred only in "else"
code path of "if not matchmod.patkind(pat)" examination.
revset: make default kind of pattern for "contains()" rooted at cwd

Before this patch, default kind of pattern for revset predicate
"contains()" is treated as the exact file path rooted at the root of
the repository. This decreases usability, because:

  - all other predicates taking pattern argument (also "filelog()")
    treat such pattern as the path rooted at the current working
    directory

  - "contains()" doesn't describe this difference in its help

  - this difference may confuse users

    for example, this prevents revset aliases from sharing same
    argument between "contains()" and other predicates


This patch makes default kind of pattern for revset predicate
"contains()" be rooted at the current working directory.

This patch uses "pathutil.canonpath()" instead of creating "match"
object for efficiency.
revset: avoid loop for "match.files()" having always one element for efficiency

This patch avoids the loop for "match.files()" having always one
element in revset predicate "filelog()" for efficiency: "match" object
"m" is constructed with "[pat]" as "patterns" argument.
revset: use "canonpath()" for "filelog()" pattern without explicit kind

Before this patch, revset predicate "filelog()" uses "match.files()"
to get filename also for the pattern without explicit kind.

But in such case, only canonicalization of relative path is required,
and other initializations of "match" object including regexp
compilation are meaningless.

This patch uses "pathutil.canonpath()" directly for "filelog()"
pattern without explicit kind like "glob:", for efficiency.

This patch also does below as a part of introducing "canonpath()":

  - move location of "matchmod.match()" invocation, because "m" is no
    more used in "if not matchmod.patkind(pat)" code path

  - omit passing "default" argument to "matchmod.match()", because
    "pat" should have explicit kind of pattern in this code path
revset: add explanation about the pattern without explicit kind

Before this patch, online help of "adds()", "contains()", "filelog()",
"file()", "modifies()" and "removes()" predicates doesn't explain
about how the pattern without explicit kind like "glob:" is treated,
even though each predicates treat it differently:

  - as "relpath:" by "adds()", "modifies()" and "removes()"

  - as "glob:" by "file()"

  - as special by "contains()" and "filelog()"
    - be relative to cwd, and
    - match against a file exactly
      ("relpath:" matches also against a directory)

This may confuse users.

This patch adds explanation about the pattern without explicit kind
to these predicates.
doc: add description about pattern matching against directories

Before this patch, there is no explicit description about pattern
matching against directories, even though users may understand it from
"plain examples" in "hg help patterns".

This patch adds description about pattern matching against
directories.
url: added authuri when login information is requested (issue3209)

When users are using a revset they can get multiple password prompts.
This prompts have no extra information about which password is being requested
so I added the authuri to the prompt to make it recognizable.

As in:
$ hg log -r "outgoing('https://bitbucket.org/mg/test') -
outgoing('https://bitbucket.org/nesneros/test')"
http authorization required
realm: Bitbucket.org HTTP
user: interrupted!

I changed it to describe the url when prompting for password.
As in:
$ hg log -r "outgoing('https://bitbucket.org/mg/test') -
outgoing('https://bitbucket.org/nesneros/test')"
http authorization required for https://bitbucket.org/mg/test
realm: Bitbucket.org HTTP
user: interrupted!