title: two Userdefined variables get conflict in Jmeter while merging thread group
body: <p>Hi merged two thread groups in to single test plan and have two User defined variable element for them</p>
  
  <p>In both User defined variables I have a variable called rubyUrl which has different value in each thread group
  when I execute the test plan together I am facing Issues because of the variable name conflict between
  two different thread groups</p>
  
  <p>please help me how can I tell Jmeter that It should pick the variable from which thread group</p>