fix: sshd config validation test on 20.04 (#5054)

The sshd config validation test was failing on 20.04 environments, output:
Unable to load host key: /etc/ssh/ssh_host_rsa_key
Unable to load host key: /etc/ssh/ssh_host_dsa_key
Unable to load host key: /etc/ssh/ssh_host_ecdsa_key
Unable to load host key: /etc/ssh/ssh_host_ed25519_key
sshd: no hostkeys available -- exiting.
+ exit 1

The fix greps the sshd config file itself, and works on both 20.04 and 18.04

test/e2e/kubernetes/scripts/sshd-config-validate.sh

@@ -24,8 +24,7 @@ CONFIGS=("ClientAliveInterval 120"
 "X11Forwarding no"
 "MaxAuthTries 4"
 "Banner /etc/issue.net"
-"AcceptEnv LANG"
-"AcceptEnv LC_*"
+"AcceptEnv LANG LC_*"
 "Subsystem sftp /usr/lib/openssh/sftp-server"
 "UsePAM yes"
 "UseDNS no"
@@ -33,7 +32,7 @@ CONFIGS=("ClientAliveInterval 120"
 
 for ((i = 0; i < ${#CONFIGS[@]}; i++))
 do
-    sshd -T | grep -i "${CONFIGS[$i]}" || exit 1
+    grep -i "${CONFIGS[$i]}" /etc/ssh/sshd_config || exit 1
 done
 
 CONFIGS=("RSAAuthentication yes"