yast2-mail: fixed hang after saving mail-server-configuration

This update fixes the following issue with yast2-mail:
- bnc#800788: ag_postfix_mastercf process hangs the system, after which it is killed by kernel, when saving mail server settings with Yast "Mail Server" module

Fixed bugs
bnc#800788
ag_postfix_mastercf process hangs the system, after which it is killed by kernel, when saving mail server settings with Yast "Mail Server" module
Selected Binaries
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