Adding Support of Nonblocking socket

Adding support for Nonblocking socket so, pldm will not blocked during
data transfer between host and BMC. in previous case pldm was blocked
if DMA transfer blocked in middle of operation.

Signed-off-by: Kamalkumar Patel <[email protected]>

Author: Patel-Kamalkumar

common/utils.hpp

@@ -56,12 +56,13 @@ struct CustomFD
     CustomFD(CustomFD&&) = delete;
     CustomFD& operator=(CustomFD&&) = delete;
 
-    CustomFD(int fd) : fd(fd)
+    CustomFD(int fd, bool closeOnOutScope = true) :
+        fd(fd), closeOnOutScope(closeOnOutScope)
     {}
 
     ~CustomFD()
     {
-        if (fd >= 0)
+        if (fd >= 0 && closeOnOutScope)
         {
             close(fd);
         }
@@ -74,6 +75,7 @@ struct CustomFD
 
   private:
     int fd = -1;
+    bool closeOnOutScope = true;
 };
 
 /** @brief Calculate the pad for PLDM data