Various fixes and features for bigip modules (#39972)

* Removed forwarders parameter that did not work
* Updated coding conventions
* Added ssl_cipher_suite and ssl_protocols to bigip_device_httpd
* Added more unit tests

test/units/modules/network/f5/fixtures/load_sys_httpd_non_default.json

@@ -0,0 +1,36 @@
+{
+    "kind": "tm:sys:httpd:httpdstate",
+    "selfLink": "https://localhost/mgmt/tm/sys/httpd?ver=12.1.2",
+    "allow": [
+        "All"
+    ],
+    "authName": "BIG-IP",
+    "authPamDashboardTimeout": "off",
+    "authPamIdleTimeout": 1200,
+    "authPamValidateIp": "on",
+    "fastcgiTimeout": 300,
+    "fipsCipherVersion": 0,
+    "hostnameLookup": "off",
+    "logLevel": "warn",
+    "maxClients": 10,
+    "redirectHttpToHttps": "disabled",
+    "requestBodyMaxTimeout": 0,
+    "requestBodyMinRate": 500,
+    "requestBodyTimeout": 60,
+    "requestHeaderMaxTimeout": 40,
+    "requestHeaderMinRate": 500,
+    "requestHeaderTimeout": 20,
+    "sslCertfile": "/etc/httpd/conf/ssl.crt/server.crt",
+    "sslCertkeyfile": "/etc/httpd/conf/ssl.key/server.key",
+    "sslCiphersuite": "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384",
+    "sslOcspDefaultResponder": "http://127.0.0.1",
+    "sslOcspEnable": "off",
+    "sslOcspOverrideResponder": "off",
+    "sslOcspResponderTimeout": 300,
+    "sslOcspResponseMaxAge": -1,
+    "sslOcspResponseTimeSkew": 300,
+    "sslPort": 443,
+    "sslProtocol": "all -SSLv2",
+    "sslVerifyClient": "no",
+    "sslVerifyDepth": 10
+}