Merge pull request #8817 from yuwata/cleanup-nsflags

core: allow to specify RestrictNamespaces= multiple times

diff --cc man/systemd.exec.xml
Simple merge

diff --cc src/core/dbus-execute.c
Simple merge

diff --cc src/core/execute.c
Simple merge

diff --cc src/core/load-fragment.c
Simple merge

diff --cc src/shared/bus-unit-util.c
Simple merge

diff --cc src/shared/bus-util.c
Simple merge

diff --cc src/test/test-execute.c
Simple merge