create /opt if not exist

ee/cli/plugins/site_functions.py

@@ -1186,7 +1186,8 @@ def operateOnPagespeed(self, data):
 
 def cloneLetsEncrypt(self):
     letsencrypt_repo = "https://github.com/letsencrypt/letsencrypt"
-
+    if not os.path.isdir("/opt"):
+        EEFileUtils.mkdir(self,"/opt")
     try:
         Log.info(self, "Downloading {0:20}".format("LetsEncrypt"), end=' ')
         EEFileUtils.chdir(self, '/opt/')

ee/core/aptget.py

@@ -198,7 +198,7 @@ class EEAptGet():
 
     def download_only(self,package_name,repo_url=None,repo_key=None):
         """
-        Similar to `apt-get install  --download-only`
+        Similar to `apt-get install --download-only PACKAGE_NAME`
         """
         packages = ' '.join(package_name)
         try: