Move network protocol to a constexpr struct

Another clang-tidy warning about global construction of things that
could throw.  Considering we don't actually use this as a map anywhere,
move to a constexpr array of values.

Tested:  Clang-tidy now passes cert-* check.

curl --insecure --user root:0penBmc https://192.168.7.2/redfish/v1/Managers/bmc/NetworkProtocol
{
  "@odata.id": "/redfish/v1/Managers/bmc/NetworkProtocol",
  "@odata.type": "#ManagerNetworkProtocol.v1_5_0.ManagerNetworkProtocol",
  "Description": "Manager Network Service",
  "FQDN": "qemux86",
  "HTTP": {
    "Port": 0,
    "ProtocolEnabled": false
  },
  "HTTPS": {
    "Certificates": {
      "@odata.id": "/redfish/v1/Managers/bmc/NetworkProtocol/HTTPS/Certificates"
    },
    "Port": 443,
    "ProtocolEnabled": true
  },
  "HostName": "qemux86",
  "IPMI": {
    "Port": null,
    "ProtocolEnabled": false
  },
  "Id": "NetworkProtocol",
  "NTP": {
    "NTPServers": [],
    "ProtocolEnabled": true
  },
  "Name": "Manager Network Protocol",
  "SSH": {
    "Port": 22,
    "ProtocolEnabled": true
  },
  "Status": {
    "Health": "OK",
    "HealthRollup": "OK",
    "State": "Enabled"
  }
}%

Change-Id: I2bdae321fc1cbb418ed302453ec6109ee2ed32c1
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/lib/network_protocol.hpp b/redfish-core/lib/network_protocol.hpp
index b82e697..65b90f7 100644
--- a/redfish-core/lib/network_protocol.hpp
+++ b/redfish-core/lib/network_protocol.hpp
@@ -54,10 +54,8 @@
                std::string, sdbusplus::message::object_path, uint32_t,
                std::string, sdbusplus::message::object_path>;
 
-const static boost::container::flat_map<const char*, std::string>
-    protocolToDBus{{"SSH", "dropbear"},
-                   {"HTTPS", "bmcweb"},
-                   {"IPMI", "phosphor-ipmi-net"}};
+const static std::array<std::pair<const char*, const char*>, 3> protocolToDBus{
+    {{"SSH", "dropbear"}, {"HTTPS", "bmcweb"}, {"IPMI", "phosphor-ipmi-net"}}};
 
 inline void
     extractNTPServersAndDomainNamesData(const GetManagedObjects& dbusData,