Rename test/api/vgcreate.c to vgtest.c to reduce filename conflicts in tree.

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

diff --git a/test/api/vgcreate.c b/test/api/vgtest.c
similarity index 100%
rename from test/api/vgcreate.c
rename to test/api/vgtest.c