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Rename all variables/fields/map keys associated with the
`com.docker.network.host_ipv4` option from `HostIP` to `HostIPv4`.
Rationale:
* This makes the variable/field name consistent with the option
name.
* This makes the code more readable because it is clear that the
variable/field does not hold an IPv6 address. This will hopefully
avoid bugs like <https://github.com/moby/moby/issues/46445> in the
future.
* If IPv6 SNAT support is ever added, the names will be symmetric.
Signed-off-by: Richard Hansen <rhansen@rhansen.org>