IBM ConfigFile upload : Fix content-type validation

While uploading the ConfigFiles, BMC was only checking if it is
not multipart/form-data. This commit is to change the validation
to check for only allowed content-type: application/octet-stream

Tested by:
 Uploaded Configfile with below content-types
 1. application/octet-stream - passed
 2. application/x-www-form-urlencoded - failed
 3. application/json - failed
 4. multipart/form-data - failed
 5. text/plain - failed
 6. application/octet-streamabcd - failed

Signed-off-by: Sunitha Harish <sunithaharish04@gmail.com>
Change-Id: Iedadacd2306f729479ee36afff52e29d8112daf6
diff --git a/include/ibm/management_console_rest.hpp b/include/ibm/management_console_rest.hpp
index cab6523..e6b5cb2 100644
--- a/include/ibm/management_console_rest.hpp
+++ b/include/ibm/management_console_rest.hpp
@@ -86,17 +86,15 @@
 {
     std::error_code ec;
     // Check the content-type of the request
-    std::string_view contentType = req.getHeaderValue("content-type");
-    if (boost::starts_with(contentType, "multipart/form-data"))
+    boost::beast::string_view contentType = req.getHeaderValue("content-type");
+    if (!boost::iequals(contentType, "application/octet-stream"))
     {
-        BMCWEB_LOG_DEBUG
-            << "This is multipart/form-data. Invalid content for PUT";
-
         asyncResp->res.result(boost::beast::http::status::not_acceptable);
         asyncResp->res.jsonValue["Description"] = contentNotAcceptableMsg;
         return;
     }
-    BMCWEB_LOG_DEBUG << "Not a multipart/form-data. Continue..";
+    BMCWEB_LOG_DEBUG
+        << "File upload in application/octet-stream format. Continue..";
 
     BMCWEB_LOG_DEBUG
         << "handleIbmPut: Request to create/update the save-area file";