Make RMC maxRqstAttempts variable configurable

maxRqstAttempts is hardcoded in RmcProxy.hpp and Constants.hpp:

  RmcProxy(
    const unsigned short rmcPort = RMC_PORT,
    const int netTimeout = RMC_NET_TIMEOUT,
    const unsigned int maxRqstAttempts = RMC_MAX_RQST_ATTEMPTS);

/**
 * The maximum number of attempts a retriable RMC request should be issued.
 */
const int RMC_MAX_RQST_ATTEMPTS = 10;

There was the question from community if it can be modified.