Werk #6935: Improvements in Solaris Agent packages

This werk introduces some improvements in the postinstall- and postuninstall-routines for Solaris agent packages that come from the agent bakery:

• Properly remove the installed inetd service. This has been done incompletely before, which could lead to problems on reinstallation.
• simplified syntax in order to avoid errors like /var/sadm/pkg/check-mk-agent/install/postinstall: !: not found on some Solaris systems.
• some improvements in timing and robustness.

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