tools/updates doesn't handle "+" characters properly

[akien-mga]

The tools/updates does not pass package names with a "+" character properly in its links to external services (bugzilla, wiki).

For exemple the quick searches for "gtk+3.0" give:

• https://bugs.mageia.org/buglist.cgi?columnlist=version%2Cassigned_to%2Cbug_status%2Cresolution%2Cshort_desc%2Ccf_rpmpkg%2Cstatus_whiteboard&email1=qa-bugs%40ml.mageia.org&emailassigned_to1=1&emailcc1=1&emailtype1=substring&field0-0-0=cf_rpmpkg&field0-0-2=short_desc&product=Mageia&query_format=advanced&type0-0-0=substring&type0-0-1=substring&type0-0-2=substring&type0-0-3=matches&value0-0-0=gtk+3.0&value0-0-1=gtk+3.0&value0-0-2=gtk+3.0&value0-0-3=%22gtk+3.0%22&order=bug_id%20DESC&query_based_on=
• https://wiki.mageia.org/mw-en/index.php?title=Special%3ASearch&redirs=1&search=gtk+3.0&fulltext=Search&ns102=1&redirs=1&title=Special%3ASearch&advanced=1&fulltext=Advanced+search

In both link, the "+" character is interpreted as a space character. For the wiki at least it should be translated to "%2B".

Note that there might be other problematic characters that we just haven't encountered yet (though I don't think there are many non-alphanumeric characters in package names, probably just - _ +)