tests/run-tests: avoid C:/ in arguments

MSYS replaces C:/... in arguments with C;... as it interprets the C:/ as a
colon separated POSIX path list. The colon is replaced with ; (path separator
on Windows) according to

  http://www.mingw.org/wiki/Posix_path_conversion

So we must not replace \ with / for neither $TESTTMP nor $TESTDIR, but we
have to keep replacing \ with / for the Popen4 call of function hghave. If we
don't do the latter, test-run-tests.t will fail with

  $ python run-tests.py --local test-run-tests.t

  --- C:\Users\adi\hgrepos\hg-main\tests\test-run-tests.t
  +++ C:\Users\adi\hgrepos\hg-main\tests\test-run-tests.t.err
  @@ -70,6 +70,7 @@
     tested
   #else
     $ echo skipped
  +  skipped
   #endif

   #if false


An additional tweak in test-ssh.t is needed that globs away an encoded path,
as it can't be translated back to $TESTTMP, because the backslashes in the
output have been already encoded as %5C.

This patch makes test-ssh.t pass in MSYS on Windows.

tests/run-tests.py

@@ -599,8 +599,9 b' def tsttest(test, wd, options, replaceme'
 
     def hghave(reqs):
         # TODO: do something smarter when all other uses of hghave is gone
+        tdir = TESTDIR.replace('\\', '/')
         proc = Popen4('%s -c "%s/hghave %s"' %
-                      (options.shell, TESTDIR, ' '.join(reqs)), TESTDIR, 0)
+                      (options.shell, tdir, ' '.join(reqs)), TESTDIR, 0)
         proc.communicate()
         ret = proc.wait()
         if wifexited(ret):
@@ -909,7 +910,7 b' def runone(options, test):'
 
     # Make a tmp subdirectory to work in
     testtmp = os.environ["TESTTMP"] = os.environ["HOME"] = \
-        os.path.join(HGTMP, os.path.basename(test)).replace('\\', '/')
+        os.path.join(HGTMP, os.path.basename(test))
 
     replacements = [
         (r':%s\b' % options.port, ':$HGPORT'),
@@ -1229,7 +1230,7 b' def main():'
             del os.environ[k]
 
     global TESTDIR, HGTMP, INST, BINDIR, PYTHONDIR, COVERAGE_FILE
-    TESTDIR = os.environ["TESTDIR"] = os.getcwd().replace('\\', '/')
+    TESTDIR = os.environ["TESTDIR"] = os.getcwd()
     if options.tmpdir:
         options.keep_tmpdir = True
         tmpdir = options.tmpdir

tests/test-ssh.t

@@ -332,7 +332,7 b' Test hg-ssh in read-only mode:'
   $ echo "baz" > bar
   $ hg ci -A -m "unpushable commit" bar
   $ hg push --ssh "sh ../ssh.sh"
-  pushing to ssh://user@dummy/$TESTTMP/remote
+  pushing to ssh://user@dummy/*/remote (glob)
   searching for changes
   remote: Permission denied
   remote: abort: prechangegroup.hg-ssh hook failed