SPORADICALLY ON DAILY-5.6

Problem
-------
i_rpl.rpl_semi_sync_reset_master_bug26748533 fails
sporadically on daily-5.6 and weekly-5.6 with

... [ERROR] Read semi-sync reply network error: (errno:
    1158)


Analysis
--------
In general, all network read errors are logged as
"Got an error reading communication packet".

In case of semisync, network read errors occured when dump
thread is waiting for the acknowledgements from slave are
logged as "Read semi-sync reply network error".

Since such network errors are common unexpected errors,
they are currently being suppressed in 5.7+.

This patch only aims at adding a suppression for the
above error.

Fix
---
Added a suppression in install_semisync_master.inc.