Pldmtool change to fetch pdrs based on TerminusID

This commit adds a new option "-n" to getPDR in the pldmtool using
which we can retrieve the PDRs based on the terminus ID.

Tested:
 ./pldmtool platform getpdr -h
get platform descriptor records
Usage: ./pldmtool platform GetPDR [OPTIONS]

Options:
  -h,--help                   Print this help message and exit
  -m,--mctp_eid UINT          MCTP endpoint ID
  -v,--verbose
[Option Group: Required Option]
  Retrieve individual PDR, all PDRs, PDRs of a requested type or retrieve all PDRs of the requested terminusID
  [Exactly 1 of the following options is required]
  Options:
    -d,--data UINT              retrieve individual PDRs from a PDR Repository
                                eg: The recordHandle value for the PDR to be retrieved and 0 means get first PDR in the repository.
    -t,--type TEXT              retrieve all PDRs of the requested type
                                supported types:
                                [terminusLocator, stateSensor, numericEffecter, stateEffecter, EntityAssociation, fruRecord, ... ]
    -i,--terminusID UINT          retrieve all PDRs of the requested terminusID
                                supported IDs:
                                 [1, 2, 208...]
    -a,--all                    retrieve all PDRs from a PDR repository

Example 1:
./pldmtool platform getpdr -i 0
[]

Example 2:
./pldmtool platform getpdr -i 2
Copied the output here:
https://gist.github.com/Pavithrab7/4218104bc7e58951ff91fe5b49e562b0

Change-Id: I8b78818abbbbb3678e180d2bd1f38017454fd0d3
Signed-off-by: Pavithra Barithaya <pavithra.b@ibm.com>
diff --git a/pldmtool/pldm_cmd_helper.hpp b/pldmtool/pldm_cmd_helper.hpp
index 6f185dd..1f21ea2 100644
--- a/pldmtool/pldm_cmd_helper.hpp
+++ b/pldmtool/pldm_cmd_helper.hpp
@@ -109,6 +109,26 @@
         return mctp_eid;
     }
 
+    /**
+     * @brief get PLDM type
+     *
+     * @return pldm type
+     */
+    inline std::string getPLDMType()
+    {
+        return pldmType;
+    }
+
+    /**
+     * @brief get command name
+     *
+     * @return  the command name
+     */
+    inline std::string getCommandName()
+    {
+        return commandName;
+    }
+
   private:
     const std::string pldmType;
     const std::string commandName;