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metering: check that we are talking to rrdached and not directly to file

Merged andreas.fenkart requested to merge taw/dss-mainline:MR_metering_unit_tests into master

on developer systems we are not talking through the rrdcached system if by accident an rrdcached is running system wide, unit tests might hang.

#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f5bd191b530 in _L_lock_31 () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007f5bd191b079 in do_system (line=0x8b440d "killall -9 rrdcached") at ../sysdeps/posix/system.c:68
#3  0x00000000005f9a4d in dss::Metering::checkDBReset (this=0x7ffceee3f5a0, _sampledAt=..., _rrdFileName='0' <repeats 33 times>, "d.rrd")
    at ../../build/../src/metering/metering.cpp:425
#4  0x00000000004d199e in testMetering::test_checkDBReset (this=0x7ffceee3f5a0, _sampledAt=..., _rrdFileName='0' <repeats 33 times>, "d.rrd")
    at ../../build/../tests/meteringtests.cpp:62

Signed-off-by: Andreas Fenkart andreas.fenkart@dev.digitalstrom.org