missing files from gitignore

there are some missing files from gitignore:

	doc/sphinx/arm/platforms.rst
	kea_version.h
	src/bin/agent/agent_parser.report
	src/bin/d2/d2_parser.report
	src/bin/netconf/netconf_parser.report
	src/hooks/dhcp/flex_option/libloadtests/flex_option_unittests
	src/hooks/dhcp/flex_option/tests/flex_option_unittests
	src/hooks/dhcp/high_availability/libloadtests/ha_unittests
	src/lib/yang/pretests/sysrepo_setup_tests