[5096] Added cql database type

src/bin/dhcp4/dhcp4_lexer.ll

@@ -270,6 +270,15 @@ ControlCharacterFill            [^"\\]|\\{JSONEscapeSequence}
     }
 }
 
+\"cql\" {
+    switch(driver.ctx_) {
+    case isc::dhcp::Parser4Context::DATABASE_TYPE:
+        return isc::dhcp::Dhcp4Parser::make_CQL(driver.loc_);
+    default:
+        return isc::dhcp::Dhcp4Parser::make_STRING("cql", driver.loc_);
+    }
+}
+
 \"user\" {
     switch(driver.ctx_) {
     case isc::dhcp::Parser4Context::LEASE_DATABASE:

src/bin/dhcp4/dhcp4_parser.yy

@@ -66,6 +66,7 @@ using namespace std;
   MEMFILE "memfile"
   MYSQL "mysql"
   POSTGRESQL "postgresql"
+  CQL "cql"
   USER "user"
   PASSWORD "password"
   HOST "host"
@@ -495,6 +496,7 @@ database_type: TYPE {
 db_type: MEMFILE { $$ = ElementPtr(new StringElement("memfile", ctx.loc2pos(@1))); }
        | MYSQL { $$ = ElementPtr(new StringElement("mysql", ctx.loc2pos(@1))); }
        | POSTGRESQL { $$ = ElementPtr(new StringElement("postgresql", ctx.loc2pos(@1))); }
+       | CQL { $$ = ElementPtr(new StringElement("cql", ctx.loc2pos(@1))); }
        ;
 
 user: USER {

src/bin/dhcp6/dhcp6_lexer.ll

@@ -264,6 +264,15 @@ ControlCharacterFill            [^"\\]|\\{JSONEscapeSequence}
     }
 }
 
+\"cql\" {
+    switch(driver.ctx_) {
+    case isc::dhcp::Parser6Context::DATABASE_TYPE:
+        return isc::dhcp::Dhcp6Parser::make_CQL(driver.loc_);
+    default:
+        return isc::dhcp::Dhcp6Parser::make_STRING("cql", driver.loc_);
+    }
+}
+
 \"user\" {
     switch(driver.ctx_) {
     case isc::dhcp::Parser6Context::LEASE_DATABASE:

src/bin/dhcp6/dhcp6_parser.yy

@@ -59,6 +59,7 @@ using namespace std;
   MEMFILE "memfile"
   MYSQL "mysql"
   POSTGRESQL "postgresql"
+  CQL "cql"
   USER "user"
   PASSWORD "password"
   HOST "host"
@@ -485,6 +486,7 @@ database_type: TYPE {
 db_type: MEMFILE { $$ = ElementPtr(new StringElement("memfile", ctx.loc2pos(@1))); }
        | MYSQL { $$ = ElementPtr(new StringElement("mysql", ctx.loc2pos(@1))); }
        | POSTGRESQL { $$ = ElementPtr(new StringElement("postgresql", ctx.loc2pos(@1))); }
+       | CQL { $$ = ElementPtr(new StringElement("cql", ctx.loc2pos(@1))); }
        ;
 
 user: USER {