check_katello_currency

Changes since 0.5.2:

• systems without Katello agent won't break generic statistics anymore (see issue #5)
• added systems_noagent perfdata counter displaying the amount of systems without Katello agent
• previously only the first 20 systems were evaluated - this limit has been increased

Changes since 0.5.1:

• additional information removed from timestamp strings (see issue #4)
• target systems can now also be specified by a single -s / --system parameter with multiple systems separated by commas

Changes since initial version:

• SSL verification can now be disabled (see issue #1)
• checking invalid content hosts can be omitted by excluding them (-x / --exclude parameters, see issues #2 and #3)
• added error message when checking invalid content hosts