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spectrum: Avoid newline in SpectrumValue ostream operator

Tom Henderson requested to merge tomhenderson/ns-3-dev:spectrum-value-output-stream into master

The ostream operator<< for SpectrumValue has a newline, resulting in an extra line in log output.

For instance, logging LteUePhy::ReportDataInterference() with an NS_LOG_FUNCTION(this << sinr); will print lines like this:

+0.502999999s 1 LteUePhy:ReportDataInterference(0x562c4b249990, 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 
3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 
3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 
3.16228e-20
)

After applying this patch, the same example prints:

+0.502999999s 1 LteUePhy:ReportDataInterference(0x560b17cfd990, 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 
3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 
3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 3.16228e-20 
3.16228e-20)

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