New `snap switch` command

During one of the recent conferences the topic of snap switch came up. The idea is that there should be a command that lets can switch the channel of a snap easily without refreshing to it right away. The functionality is largely provided by snap refresh --channel=$CHANNEL $SNAP. But the later will always do a refresh and only switch the channel if the refresh worked. In some cases (airplane with no network) it may be desirable to just switch for later.

Small branch with this feature:

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