Parse the uptime command's output capturing the days, hours and
minutes that the system has been up. Returns a dictionary of the captured
values.
>>> UPTIME_FORMAT % parseUptime("up 1 day, 1:42")
'uptime: days=1, hours=1, minutes=42'
>>> UPTIME_FORMAT % parseUptime("up 5 days, 1:42")
'uptime: days=5, hours=1, minutes=42'
>>> UPTIME_FORMAT % parseUptime("up 3 days, 6 min")
'uptime: days=3, hours=0, minutes=6'
>>> UPTIME_FORMAT % parseUptime("up 1:14")
'uptime: days=0, hours=1, minutes=14'
>>> UPTIME_FORMAT % parseUptime("up 4 min")
'uptime: days=0, hours=0, minutes=4'
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