Ldbus fixes#5

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RafaGago wants to merge 4 commits intododo:masterfrom

RafaGago:ldbus_fixes

Commits on Feb 12, 2018

interface: Don't mutate user options
Rafael Gago
committed
ldbus: fix append_arg
Rafael Gago
committed
ldbus: Allow specifying variant types for args
Rafael Gago
committed

Commits on Feb 13, 2018

ldbus: Fix iter_args
Rafael Gago
committed