Missing settings on Impish/Oracle arm64 cause ubuntu_kernel_selftests failures

[Krzysztof Kozlowski]

2022.01.31/impish/linux-oracle/5.13.0-1018.22
VM.Standard.A1.Flex-4c.8m
test: ubuntu_kernel_selftests
---
11:28:33 DEBUG| [stdout] # Error: ipv4: FIB table does not exist.
11:28:33 DEBUG| [stdout] # Error: ipv6: FIB table does not exist.
---
13241 11:34:24 DEBUG| [stdout] # TEST: IPv4 route with MPLS encap [FAIL]
13242 11:34:24 DEBUG| [stdout] # TEST: IPv4 route with MPLS encap - check [FAIL]
13243 11:34:24 DEBUG| [stdout] # TEST: IPv4 route with MPLS encap and v6 gateway [FAIL]
13244 11:34:24 DEBUG| [stdout] # TEST: IPv4 route with MPLS encap, v6 gw - check [FAIL]
---
11:28:32 DEBUG| [stdout] # Error: Unknown device type.
---
Probably effect of previous failure:

13473 11:44:37 DEBUG| [stdout] # selftests: net: icmp.sh
13474 11:44:37 DEBUG| [stdout] # Cannot create namespace file "/run/netns/ns1": File exists
13475 11:44:47 DEBUG| [stdout] # FAIL - got ICMP response from , should be 192.0.0.8
---
13563 11:45:02 DEBUG| [stdout] # TEST: IPv4: redirect exception [FAIL]
13564 11:45:02 DEBUG| [stdout] # Error: argument "red" is wrong: Invalid VRF
---
13010 11:33:36 DEBUG| [stdout] # selftests: net: l2tp.sh
13011 11:33:36 DEBUG| [stdout] # RTNETLINK answers: No such file or directory
---

[Po-Hsu Lin (cypressyew)]

For icmp_redirect from selftests/net with "Error: argument "red" is wrong: Invalid VRF" (require CONFIG_NET_VRF), please track it in bug 1961745