[travis] Move VST to required suite.
[travis] Move VST to required suite.

coq/coq,ppedrot/coq,Lionel-Rieg/coq,amintimany/coq,gares/coq,ejgallego/coq,coq/coq,ejgallego/coq,JasonGross/coq,JasonGross/coq,maximedenes/coq,gares/coq,Lionel-Rieg/coq,letouzey/coq-wip,ejgallego/coq,gares/coq,letouzey/coq-wip,ejgallego/coq,maximedenes/coq,gares/coq,Matafou/coq,SkySkimmer/coq,william-lawvere/coq,Zimmi48/coq,ppedrot/coq,amintimany/coq,silene/coq,maximedenes/coq,letouzey/coq-wip,Zimmi48/coq,maximedenes/coq,silene/coq,SkySkimmer/coq,Matafou/coq,Zimmi48/coq,coq/coq,Zimmi48/coq,william-lawvere/coq,william-lawvere/coq,silene/coq,maximedenes/coq,letouzey/coq-wip,Lionel-Rieg/coq,SkySkimmer/coq,amintimany/coq,SkySkimmer/coq,coq/coq,ppedrot/coq,gares/coq,ppedrot/coq,JasonGross/coq,ppedrot/coq,letouzey/coq-wip,Matafou/coq,JasonGross/coq