1) Opportunist 2) Self-seeker 
• (n.) One who adapts his opinions and manners to the times; one who obsequiously compiles with the ruling power; -- now used only in a bad sense.
Time'serv`er noun One who adapts his opinions and manners to the times; one who obsequiously compiles with the ruling power; -- now used only in a bad sense. 
[n] - one who conforms to current ways and opinions for personal advantage
noun one who conforms to current ways and opinions for personal advantage