T6934: Add preshared key for zabbix-agent monitoring service

- Allow configure preshared key for zabbix-agent
- Added op mode command for generatre random psk secret
- Removed duplicate xml definition for psk settings


Configure authentication mode:
```
# set service monitoring zabbix-agent authentication mode
Possible completions:
   pre-shared-secret    Use a pre-shared secret key
```

Configure PSK Settings:
```
# set service monitoring zabbix-agent authentication psk
Possible completions:
   id                   ID for authentication
   secret               pre-shared secret key

```

Generate Random PSK:
```
$ generate psk random
Possible completions:
  <Enter>               Execute the current command
  size                  Key size in bytes

```

1 files changed, 14 insertions, 0 deletions

diff --git a/interface-definitions/include/auth-mode-pre-shared-secret.xml.i b/interface-definitions/include/auth-mode-pre-shared-secret.xml.i
new file mode 100644
index 000000000..cf1003917
--- /dev/null
+++ b/interface-definitions/include/auth-mode-pre-shared-secret.xml.i
@@ -0,0 +1,14 @@
+<!-- include start from auth-mode-pre-shared-secret.xml.i -->
+<leafNode name="mode">
+  <properties>
+    <help>Authentication mode</help>
+    <completionHelp>
+      <list>pre-shared-secret</list>
+    </completionHelp>
+    <valueHelp>
+      <format>pre-shared-secret</format>
+      <description>Use a pre-shared secret key</description>
+    </valueHelp>
+  </properties>
+</leafNode>
+<!-- include end -->