Move find_prev_token to parse_utils.
Move find_prev_token to parse_utils.

zhiyuanshi/pgcli,koljonen/pgcli,w4ngyi/pgcli,janusnic/pgcli,w4ngyi/pgcli,bitmonk/pgcli,janusnic/pgcli,TamasNo1/pgcli,n-someya/pgcli,yx91490/pgcli,j-bennet/pgcli,MattOates/pgcli,bitemyapp/pgcli,johshoff/pgcli,lk1ngaa7/pgcli,suzukaze/pgcli,dbcli/vcli,yx91490/pgcli,darikg/pgcli,j-bennet/pgcli,stuartquin/pgcli,TamasNo1/pgcli,d33tah/pgcli,suzukaze/pgcli,dbcli/pgcli,bitmonk/pgcli,joewalnes/pgcli,johshoff/pgcli,d33tah/pgcli,nosun/pgcli,MattOates/pgcli,dbcli/pgcli,thedrow/pgcli,joewalnes/pgcli,nosun/pgcli,n-someya/pgcli,koljonen/pgcli,darikg/pgcli,lk1ngaa7/pgcli,bitemyapp/pgcli,dbcli/vcli,zhiyuanshi/pgcli,thedrow/pgcli