Update verto to 0.2.2 release

Update verto to 0.2.2 release

Update verto sources to 0.2.2 release versions.  verto_reinitialize()
now has a return value; check it in kdc/main.c.  Store verto-libev.c
alongside verto-k5ev.c to make it easy to diff corresponding versions
when updating.

ticket: 7018
target_version: 1.10
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@25474 dc483132-0cff-0310-8789-dd5450dbe970