Work around issues with openssh-server on travisCI.. again

Makefile

@@ -201,7 +201,7 @@ test.full: debian/Makefile
 	rm -f test.full
 	rm -f persistent.storage
 	$(TEST_HARNESS) "make $(TEST_TARGET)" $(TEST_ARGS) \
-	    config_idlebust=1 config_timestamps=1 \
+	    config_idlebust=1 config_timestamps=1 config_nossh=1 \
 	    $(TEST_EXTRA) \
 	    tests/*.expect
 	touch test.full

tests/10install1.expect

@@ -10,6 +10,13 @@ if {[info exists config_idlebust]} {
     send "chmod a+x /zfs.d/79-idlebust.sh\r"
 }
 
+# Something about TravisCI really doesnt like installing ssh.
+# See the inchroot/31-fixup-ssh.sh file for more comments
+if {[info exists config_nossh]} {
+    expect root@ramdisk {} timeout {bad 1 "shell prompt"}
+    send "chmod a-x /zfs.d/inchroot/31-fixup-ssh.sh\r"
+}
+
 expect root@ramdisk {} timeout {bad 1 "shell prompt"}
 
 send "/zfs.install --unattended"

zfs-config/packages.d/_ALWAYS.customise.add/zfs.d/inchroot/31-fixup-ssh.sh

@@ -6,5 +6,26 @@
 # kind of bug with the installation of openssh-server when you are running
 # in a nested VM - specifically travisCI, but also tested with libvirt and
 # qemu and ubuntu 14.04
+#
+# By separating it out, it can be turned off for testing in that environment
 
 apt install -y openssh-server
+
+# Additional details:
+#
+# Example log for a build exhibiting the error:
+# https://travis-ci.com/symmetryinvestments/zfs-on-root-installer/builds/75470828
+#
+# 00:54:54 Creating config file /etc/ssh/sshd_config with new version
+# 00:54:58 Creating SSH2 RSA key; this may take some time ...
+# 00:54:58 2048 SHA256:tAK/rUUwzWtXS13ICzr7aBDW6NADQ0U5ma0VRUdWHfQ root@ramdisk-566a832f (RSA)
+# 00:54:58 Creating SSH2 ECDSA key; this may take some time ...
+# 00:54:58 /etc/ssh/ssh_host_ecdsa_key.pub is not a public key file.
+# 00:54:59 dpkg: error processing package openssh-server (--configure):
+# 00:54:59  installed openssh-server package post-installation script subprocess returned error exit status 255
+#
+# Earlier debugging builds that captured the contents of the ssh config files
+# showed no syntax errors or other issues.
+#
+# The program that outputs the "not a public key file" message is simply
+# reading in the generated .pub file.