fix swift eqiad-prod container monitoring

the current status of this check was UNKNOWN

"execution of the check script exited with exception"

"The unit specification for --from should be
one of the following: hours,h,w,weeks,min"

the usage info was actually wrong for this parameter

it should be "min" and also doesn't want just "m"

also see related changes:
I0fc2c7bf97806b and  I4dfa90380558c99b 

Change-Id: Ic30b3755d16898f85c9e616ba43ad23e8e0c8496
Merge "fix swift eqiad-prod container monitoring" into production