UserDetailService improvement

[IgorBalog-Eng]

Current implementation is not optimal. It creates UserProvider per user, instead creating one user provider containing all users.

Possible improvements:

1. (with reading users from property file)

   @Bean
   public UserDetailsService users() {
   UserDetails user = User.builder()
   .username("idsUser")
   .password("$2a$10$MQ5grDaIqDpBjMlG78PFduv.AMRe9cs0CNm/V4cgUubrqdGTFCH3m")
   .roles("PROXY")
   .build();
   UserDetails admin = User.builder()
   .username("bob")
   .password("$2a$12$8ngZQYUF9pATTwNRmLiYeu6XGlLd79eb4FIgr5ezzuAA6tGLxuAyy")
   .roles("PROXY")
   .build();
   return new InMemoryUserDetailsManager(user, admin);
   }

2. 
   @Override
   protected void configure(AuthenticationManagerBuilder auth) throws Exception {
     InMemoryUserDetailsManagerConfigurer<AuthenticationManagerBuilder> builder = auth.inMemoryAuthentication();

userProperties.getUserCredentials().keySet().forEach(user -> { String password = userProperties.getPasswordForUser(user); if (password != null) { try { builder.withUser(user).password(password).roles("PROXY"); } catch (Exception e) { logger.error("Error configuring authentication for user " + user, e.getMessage()); } } }); }

Before starting investigate which solution will be optimal and check if both implementations does not create providers per user