Update test/api/test.c for simple tests involving pv/vg/lv name/uuid attributes.

Update test/api/test.c for simple tests involving pv/vg/lv name/uuid attributes.

Tests the following APIs:
- lvm_{pv|vg|lv}_get_{name|uuid}()
- lvm_{lvs|pvs}_in_vg()

Example:
lvm> vg_open VolGroup00
Success opening vg VolGroup00
lvm> vg_list_lvs VolGroup00
LVs in VG VolGroup00:
VolGroup00/LogVol00 (bFO4EU-UaDu-iuMm-N6BA-xcZc-nm3u-J5K5lu)
VolGroup00/LogVol01 (BHGsPK-PwzY-kye0-MEWa-a67z-BiYE-03ZjwM)
lvm> vg_list_pvs VolGroup00
PVs in VG VolGroup00:
/dev/sda2 (Be91pt-CqT0-4YJE-nGI6-Oisz-hy0N-l9CHgn)

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Acked-by: Thomas Woerner <twoerner@redhat.com>