Werk #6781: Add success message after signing all agents

Component	Agent bakery
Title	Add success message after signing all agents
Date	Oct 11, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p6 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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