(RFC and WIP) Send SETNAME to server, when cap setname enabled and realname is changed #465

Job	Run time
Compile Test (gcc)	1m 29s
Compile Test (clang)	44s
Features	1m 22s
Features (--disable-tdns)	35s
Features (--disable-ipv6)	1m 33s
Features (--disable-ipv6, --disable-tdns)	1m 51s
Features (--disable-tls)	1m 12s
Features (--disable-tls, --disable-tdns)	35s
Features (--disable-tls, --disable-ipv6)	32s
Features (--disable-tls, --disable-ipv6, --disable-tdns)	33s
	10m 26s

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