Add missing Readme.adoc files in test specs

test/case/ietf_interfaces/verify_all_interface_types/Readme.adoc

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+=== Verify that all interface types can be created
+==== Description
+This test verifies that all interface types can be created
+and also, testing setting the configuration in sequal (this
+takes a little longer time than send it once)
+....
+
+ lo     br-0                    br-Q.40            br-D         br-X
+  |       |                       |                  |            |
+  o       o        ethQ.10       br-Q            veth0a.20      ethX.30
+                          \     /    \               |            |
+                           ethQ       veth0b       veth0a        ethX
+                                          `---------'
+....
+
+==== Topology
+ifdef::topdoc[]
+image::../../test/case/ietf_interfaces/verify_all_interface_types/topology.png[Verify that all interface types can be created topology]
+endif::topdoc[]
+ifndef::topdoc[]
+ifdef::testgroup[]
+image::verify_all_interface_types/topology.png[Verify that all interface types can be created topology]
+endif::testgroup[]
+ifndef::testgroup[]
+image::topology.png[Verify that all interface types can be created topology]
+endif::testgroup[]
+endif::topdoc[]
+==== Test sequence
+. Initialize
+. Configure an empty bridge br-0
+. Configure bridge br-X and associated interfaces
+. Configure VETH pair
+. Configure bridge br-D and associated interfaces
+. Configure br-Q and associated interfaces
+. Verify interface 'lo' is of type loopback
+. Verify interfaces 'ethX' and 'ethQ' are of type 'ethernet' (or etherlike if running Qemu)
+. Verify interfaces 'br-0', 'br-X', 'br-D' and 'br-Q' are of type 'bridge'
+. Verify interfaces 'veth0a' and 'veth0b' are of type 'veth'
+. Verify interfaces 'veth0a.20', 'ethQ.10', 'ethX.30', 'ethQ.10' and 'br-Q.40' are of type 'vlan'
+
+
+<<<
+

test/case/ietf_system/ssh_key_authentication/Readme.adoc

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+=== Generate ssh key pair
+==== Description
+Verify that 'guest' user can fetch data using only the 'public' key
+
+==== Topology
+ifdef::topdoc[]
+image::../../test/case/ietf_system/ssh_key_authentication/topology.png[Generate ssh key pair topology]
+endif::topdoc[]
+ifndef::topdoc[]
+ifdef::testgroup[]
+image::ssh_key_authentication/topology.png[Generate ssh key pair topology]
+endif::testgroup[]
+ifndef::testgroup[]
+image::topology.png[Generate ssh key pair topology]
+endif::testgroup[]
+endif::topdoc[]
+==== Test sequence
+. Connect to the target device
+. Create a guest user on the target device
+. Write private key to a temporary file
+. Verify it is possible to fetch syslog data using public key
+
+
+<<<
+