check-code.py: avoid warning against "reverting subrepo ..." lines Before this patch, "reverting subrepo subrepo/path" lines in *.t test files require "(glob)", because such lines are recognized as "reverting path/to/managed/file" by "check-code.py". On the other hand, "(glob)" for such "reverting ..." line is recognized as useless by "runt-tests.py", because subrepo paths shown in such lines are always normalized by "util.pconvert". And this causes "no result code from test" warning. As a preparation for discarding "(glob)" from such lines in subsequent patch, this patch avoids warning against them, by adding negative lookahead assertion "(?!subrepo )" to the regexp.