### Description

Chaining the transformations {uri.param,received} and {uri.host} does not work if the address is IPv6. It works for IPv4 addresses.

#### Reproduction

We tested this with the following code: ``` if ($du != $null) { $var(received_uri)=$(du{uri.param,received}); if ($var(received_uri)!="") { $var(subscriber_host)=$(var(received_uri){uri.host}); } $var(test_tmp)=$(du{uri.param,received}{uri.host}); xlog("L_ERR", "WURST subscriber_host=$var(subscriber_host) test_tmp=$var(test_tmp) du=$du received_uri=$var(received_uri)"); } }

#### Log Messages

For IPv6 this gives us: ``` "module": "pv", "file": "pv_trans.c", "line": 1545, "function": "tr_eval_uri", "logprefix": ", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"", "message": **"invalid uri [ab:cdef:dead:beef]:1234]\n"**

"module": "core", "file": "core/lvalue.c", "line": 351, "function": "lval_pvar_assign", "logprefix": ", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"", "message": "non existing right pvar\n"

"module": "core", "file": "core/lvalue.c", "line": 411, "function": "lval_assign", "logprefix": ", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"", "message": "assignment failed at pos: (1432,19-1432,53)\n"

"module": "xlog", "file": "xlog.c", "line": 278, "function": "", "logprefix": ", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"", "message": "WURST subscriber_host=[2001:db8:0123:4567:89ab:cdef:dead:beef] test_tmp=0 du=sip:1.2.4.129;lr;received=sip[2001:db8:0123:4567:89ab:cdef:dead:beef]:1234 received_uri=sip:[2001:db8:0123:4567:89ab:cdef:dead:beef]:1234"

"module": "xlog", "file": "xlog.c", "line": 278, "function": "", "logprefix": ", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"", "message": "determineSubscribeIpFamily: contacts worked path=0 ip=[2001:db8:0123:4567:89ab:cdef:dead:beef] af=6" ```

For IPv4 it works: `{ "idx": 8, "pid": 577, "level": "ERROR", "module": "xlog", "file": "xlog.c", "line": 278, "function": "", "logprefix": ", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"", "message": "WURST subscriber_host=12.34.56.78 test_tmp=12.34.56.78 du=sip:1.2.4.149;lr;received=sip:12.34.56.78:1234 received_uri=sip:12.34.56.78:1234" } `