do not install swagger by default
It is only needed for one CI task, and that task already calls
`make .install.swagger` in setup_environment.sh.
@@ -905,7 +905,7 @@ install.systemd:
endif
.PHONY: install.tools
-install.tools: .install.golangci-lint .install.swagger ## Install needed tools
+install.tools: .install.golangci-lint ## Install needed tools
$(MAKE) -C test/tools
.PHONY: .install.goimports
