utils: Introduce and use nftnl_set_str_attr()

The function consolidates the necessary code when assigning to string
pointer attributes, namely:

* Conditional free of the previous value
* Allocation of new value
* Checking for memory allocation errors
* Setting respective flag bit

A new feature previously missing in all call sites is respecting
data_len in case the buffer up to that point did not contain a NUL-char.

Signed-off-by: Phil Sutter <phil@nwl.cc>

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