contrib/test/int/e2e: rework "skip" regex
contrib/test/int/e2e: rework "skip" regex

In its current form, it is very hard to read, maintain, or make any
sense out of.

Play with ansible/jinja a bit to enable much simpler way to list
the tests to skip.

The downside is we have to play some tricks to create a regular
expression:

 1. join the elements of skip_tests via |
 2. replace spaces with \\s
 3. prepend square brackets and parentheses with \\

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

kubernetes-incubator/cri-o,nalind/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,nalind/cri-o,nalind/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,kubernetes-incubator/ocid