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Add a new API which allows creating a GSUP client connection with more identification information than just a unit name. Instead of being selective about which idenfifiers callers may use, allow callers to pass a full-blown struct ipaccess_unit. This allows applications to use entirely custom identifiers on GSUP client connections. This change is a prerequisite for inter-MSC handover because MSCs will need to use unique identifiers towards the HLR, which isn't very easy to do with the old osmo_gsup_client_create() API. While it's always been possible to pass a unique unit_name, this is not as flexible as we would like. The old API remains for backwards compatibility. struct osmo_gsup_client grows in size but is allocated internally by the library; old calling code won't notice the difference. Change-Id: Ief09677e07d6e977247185b72c605f109aa091f5 Related: OS#3355