[5061] Added port parameter

src/bin/dhcp4/dhcp4_lexer.ll

@@ -330,6 +330,16 @@ ControlCharacterFill            [^"\\]|\\{JSONEscapeSequence}
     }
 }
 
+\"port\" {
+    switch(driver.ctx_) {
+    case isc::dhcp::Parser4Context::LEASE_DATABASE:
+    case isc::dhcp::Parser4Context::HOSTS_DATABASE:
+        return isc::dhcp::Dhcp4Parser::make_PORT(driver.loc_);
+    default:
+        return isc::dhcp::Dhcp4Parser::make_STRING("port", driver.loc_);
+    }
+}
+
 \"persist\" {
     switch(driver.ctx_) {
     case isc::dhcp::Parser4Context::LEASE_DATABASE:

src/bin/dhcp4/dhcp4_parser.yy

@@ -72,6 +72,7 @@ using namespace std;
   USER "user"
   PASSWORD "password"
   HOST "host"
+  PORT "port"
   PERSIST "persist"
   LFC_INTERVAL "lfc-interval"
   READONLY "readonly"
@@ -513,6 +514,7 @@ database_map_param: database_type
                   | user
                   | password
                   | host
+                  | port
                   | name
                   | persist
                   | lfc_interval
@@ -558,6 +560,11 @@ host: HOST {
     ctx.leave();
 };
 
+port: PORT COLON INTEGER {
+    ElementPtr p(new IntElement($3, ctx.loc2pos(@3)));
+    ctx.stack_.back()->set("port", p);
+};
+
 name: NAME {
     ctx.enter(ctx.NO_KEYWORD);
 } COLON STRING {

src/bin/dhcp6/dhcp6_lexer.ll

@@ -530,6 +530,16 @@ ControlCharacterFill            [^"\\]|\\{JSONEscapeSequence}
     }
 }
 
+\"port\" {
+    switch(driver.ctx_) {
+    case isc::dhcp::Parser6Context::LEASE_DATABASE:
+    case isc::dhcp::Parser6Context::HOSTS_DATABASE:
+        return isc::dhcp::Dhcp6Parser::make_PORT(driver.loc_);
+    default:
+        return isc::dhcp::Dhcp6Parser::make_STRING("port", driver.loc_);
+    }
+}
+
 \"persist\" {
     switch(driver.ctx_) {
     case isc::dhcp::Parser6Context::LEASE_DATABASE:

src/bin/dhcp6/dhcp6_parser.yy

@@ -63,6 +63,7 @@ using namespace std;
   USER "user"
   PASSWORD "password"
   HOST "host"
+  PORT "port"
   PERSIST "persist"
   LFC_INTERVAL "lfc-interval"
   READONLY "readonly"
@@ -498,6 +499,7 @@ database_map_param: database_type
                   | user
                   | password
                   | host
+                  | port
                   | name
                   | persist
                   | lfc_interval
@@ -543,6 +545,11 @@ host: HOST {
     ctx.leave();
 };
 
+port: PORT COLON INTEGER {
+    ElementPtr p(new IntElement($3, ctx.loc2pos(@3)));
+    ctx.stack_.back()->set("port", p);
+};
+
 name: NAME {
     ctx.enter(ctx.NO_KEYWORD);
 } COLON STRING {