Werk #11132: salesforce agent: fix encoding bug

Component	Checks & agents
Title	salesforce agent: fix encoding bug
Date	Jul 1, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p14 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The salesforce special agent did crash when the response included non-ASCII characters.

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