snap: add a "bup ls" after making a snapshot to ensure the snapshot works, and to force caching of the rev_list, which is a computation that can take many seconds otherwise (which we don't want the user to suffer through).
snap: add a "bup ls" after making a snapshot to ensure the snapshot works, and to force caching of the rev_list, which is a computation that can take many seconds otherwise (which we don't want the user to suffer through).

sagemathinc/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc