Don't rstrip off more than ,v from CVS paths.
Don't rstrip off more than ,v from CVS paths.

In cases where a filename in CVS ended with "csv,v", calling rstrip(',v') would not
only cut off the ",v", it would cut off "v,v". A simple change to use slicing
instead of rstrip fixes this.

Fixes bug 2613.

1tush/reviewboard,davidt/reviewboard,sgallagher/reviewboard,custode/reviewboard,sgallagher/reviewboard,KnowNo/reviewboard,brennie/reviewboard,custode/reviewboard,beol/reviewboard,davidt/reviewboard,reviewboard/reviewboard,davidt/reviewboard,brennie/reviewboard,chipx86/reviewboard,chipx86/reviewboard,bkochendorfer/reviewboard,KnowNo/reviewboard,1tush/reviewboard,KnowNo/reviewboard,brennie/reviewboard,1tush/reviewboard,1tush/reviewboard,sgallagher/reviewboard,beol/reviewboard,KnowNo/reviewboard,brennie/reviewboard,1tush/reviewboard,beol/reviewboard,reviewboard/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,custode/reviewboard,reviewboard/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,chipx86/reviewboard,1tush/reviewboard,davidt/reviewboard,sgallagher/reviewboard,chipx86/reviewboard,reviewboard/reviewboard,1tush/reviewboard,beol/reviewboard,bkochendorfer/reviewboard,custode/reviewboard