tests: fix select report

tests: fix select report

Simplify the function usage and clean up parameter parsing.

There were 2 significant changes made in the test itself
(they passed before because of incorrect shell string handling)

-pvs_sel 'tags="pv_tag1"' "$dev1 $dev2"
+sel pv 'tags="pv_tag1"' "$dev1" "$dev6"

-lvs_sel '(lv_name=vol1 || lv_name=vol2) || vg_tags=vg_tag1' "vol1 vol2
abc orig snap"
+sel lv '(lv_name=vol1 || lv_name=vol2) || vg_tags=vg_tag1' vol1 vol2
orig snap xyz