system tests: helpers: safer parse_table

The parse_table() helper has until now dumbly split lines
on every single '|' character. This prevents us from running
simple tests such as 'cgroupManager: (systemd|cgroupfs)'.

We now use an ugly but robust sed expression to split
on '|' but *only* when surrounded by spaces and/or beginning
or end of line. This is safe because, for readability, all
tables already keep the '|' symbols well separated from
table content.

Add tests. And, the whole reason behind this, add
an actual real test for cgroupManager and cgroupVersion.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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