net-test: not supported in netns before 4.15 if BH_TIMEOUT_SYSCTL does not exist.

Related to the following CL which is included in 4.15:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3733be14a32bae288b61ed28341e593baba983af

Change-Id: I1cc9b9c79a1eec83c47d36790c8f944b0261ff32
Merged-In: I1cc9b9c79a1eec83c47d36790c8f944b0261ff32
Test: Run vts_kernel_net_tests with Ethernet or Wi-Fi connected
Bug: 204306357
(cherry picked from commit 7b07e88d38aa3211f47dc1fcd360399d75514479)
1 file changed
tree: 9ba390b721b93e463f78c33ca6b11bed5bc6559a
  1. devicetree/
  2. net/
  3. Android.bp
  4. METADATA