ssh and pssh prefer primary_tag as hostname #85
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ssh and pssh commands were using the first element of search results but
it doesn't work well when
tags
option is set at ~/.hotdog/config.ymland the first element is not a hostname.
This change prefers to use primary_key instead of the first element if
primary_key is set and primary_key is included in the tags option.
If tags option is not set or display_search_tags option is set, behavior
doesn't change because primary_key exists as the first element.