title: How can I generate token using reportportal API
body: <p>I am looking for a way to generate token using login/password on reportportal. 
  Pretty sure, there should be a way using a API call. I am just not able to find it.</p>
  
  <p>So given, (project name, user, password), I should get a token that I can use for making other API calls.</p>
  
  <p>Thanks.</p>