PMM-14185 handle gssapi

Author: yurkovychv

pmm_psmdb-pbm_setup/configure-extra-agents.sh

@@ -13,12 +13,12 @@ client_credentials_flags="--username=${pmm_mongo_user} --password=${pmm_mongo_us
 gssapi_service_name_part=""
 
 if [[ $gssapi_enabled == "true" ]]; then
-  client_credentials_flags=(
-    --username="$gssapi_username"
-    --password="$gssapi_password"
-    --authentication-mechanism=GSSAPI
-    --authentication-database='"$external"'
-  )
+    client_credentials_flags=(
+      --username="$gssapi_username"
+      --password="$gssapi_password"
+      --authentication-mechanism=GSSAPI
+      --authentication-database='$external'
+    )
   gssapi_service_name_part="_gssapi"
 fi