### Describe the issue
Warning messages are not displayed when running bitcoin-qt 0.14.2 and 0.14.99 with -disablewallet.
It might be better to always display them.

E.g. on MainNet the "This is a pre-release test build - use at your own risk - do not use for mining or merchant applications" is lost
![image](https://user-images.githubusercontent.com/3296421/29109760-853e5394-7ce4-11e7-8f05-bfcd66ada471.png)
![image](https://user-images.githubusercontent.com/3296421/29109806-adf6e67a-7ce4-11e7-8564-8883c44656ad.png)

On TestNet also the "Warning: unknown new rules activated (versionbit 28)" is missed
![image](https://user-images.githubusercontent.com/3296421/29110269-6b24b79e-7ce6-11e7-91e7-823227eaa200.png)
![image](https://user-images.githubusercontent.com/3296421/29110035-9142cf34-7ce5-11e7-8faf-264e805cdaf4.png)

{
public:
    ~QtRPCTimerInterface() {}
    const char *Name() { return "Qt"; }
    RPCTimerBase* NewTimer(std::function<void()>& func, int64_t millis)
    {
        return new QtRPCTimerBase(func, millis);
    }
};
#include <qt/rpcconsole.moc>
/**
 * Split shell command line into a list of arguments and optionally execute the command(s).
 * Aims to emulate \c bash and friends.
 *
 * - Command nesting is possible with parenthesis; for example: validateaddress(getnewaddress())
 * - Arguments are delimited with whitespace or comma
 * - Extra whitespace at the beginning and end and between arguments will be ignored
 * - Text can be "double" or 'single' quoted
 * - The backslash \c \ is used as escape character
 *   - Outside quotes, any character can be escaped
 *   - Within double quotes, only escape \c " and backslashes before a \c " or another backslash
 *   - Within single quotes, no escaping is possible and no special interpretation takes place
 *
 * @param[in]    node    optional node to execute command on
 * @param[out]   strResult   stringified result from the executed command(chain)
 * @param[in]    strCommand  Command line to split
 * @param[in]    fExecute    set true if you want the command to be executed
 * @param[out]   pstrFilteredOut  Command line, filtered to remove any sensitive data
 */
bool RPCConsole::RPCParseCommandLine(interfaces::Node* node, std::string &strResult, const std::string &strCommand, const bool fExecute, std::string * const pstrFilteredOut, const std::string *walletID)