ipatests: increase test_ipahealthcheck timeout
test_ipahealthcheck tends to take more than 3600s to run.
Increate timeout to 4800s.
Fixes: https://pagure.io/freeipa/issue/8262
Signed-off-by: François Cami <fcami@redhat.com>
Reviewed-By: Armando Neto <abiagion@redhat.com>