### Description
I use kazoo and postgres modules on my host. I found that many database
operation generates error like
```
19(150) exec: ***
cfgtrace:request_route=[kazoo:consumer-event-presence-dialog-update]
c=[//etc/kamailio/presence-role.cfg] l=270 a=32 n=kazoo_pua_publish_presence
17(148) exec: ***
cfgtrace:request_route=[kazoo:consumer-event-presence-dialog-update]
c=[//etc/kamailio/presence-role.cfg] l=271 a=27 n=pres_refresh_watchers
Entity: line 1: parser error : Start tag expected, '<' not found
\x3c3f786d6c2076657273696f6e3d22312e302220656e636f64696e673d225554462d38223f3e3c
^
17(148) ERROR: presence_xml [notify_body.c:551]: agregate_xmls(): while parsing
xml body message
17(148) ERROR: presence_xml [notify_body.c:156]: pres_agg_nbody(): while
aggregating body
19(150) exec: ***
cfgtrace:request_route=[kazoo:consumer-event-presence-dialog-update]
c=[//etc/kamailio/presence-role.cfg] l=271 a=27 n=pres_refresh_watchers
Entity: line 1: parser error : Start tag expected, '<' not found
\x3c3f786d6c2076657273696f6e3d22312e302220656e636f64696e673d225554462d38223f3e3c
^
19(150) ERROR: presence_xml [notify_body.c:551]: agregate_xmls(): while parsing
xml body message
19(150) ERROR: presence_xml [notify_body.c:156]: pres_agg_nbody(): while
aggregating body
18(149) exec: *** cfgtrace:request_route=[kazoo:consumer-event-nodes-advertise]
c=[//etc/kamailio/nodes-role.cfg] l=66 a=63 n=assign
18(149) exec: *** cfgtrace:request_route=[kazoo:consumer-event-nodes-advertise]
c=[//etc/kamailio/nodes-role.cfg] l=74 a=16 n=if
18(149) exec: *** cfgtrace:request_route=[kazoo:consumer-event-nodes-advertise]
c=[//etc/kamailio/nodes-role.cfg] l=74 a=16 n=if
18(149) exec: *** cfgtrace:request_route=[kazoo:consumer-event-nodes-advertise]
c=[//etc/kamailio/nodes-role.cfg] l=75 a=27 n=mq_add
Entity: line 1: parser error : Start tag expected, '<' not found
\x3c3f786d6c2076657273696f6e3d22312e302220656e636f64696e673d225554462d38223f3e3c
^
17(148) ERROR: presence_xml [notify_body.c:551]: agregate_xmls(): while parsing
xml body message
17(148) ERROR: presence_xml [notify_body.c:156]: pres_agg_nbody(): while
aggregating body
Entity: line 1: parser error : Start tag expected, '<' not found
\x3c3f786d6c2076657273696f6e3d22312e302220656e636f64696e673d225554462d38223f3e3c
^
19(150) ERROR: presence_xml [notify_body.c:551]: agregate_xmls(): while parsing
xml body message
19(150) ERROR: presence_xml [notify_body.c:156]: pres_agg_nbody(): while
aggregating body
Entity: line 1: parser error : Start tag expected, '<' not found
\x3c3f786d6c2076657273696f6e3d22312e302220656e636f64696e673d225554462d38223f3e3c
^
17(148) ERROR: presence_xml [notify_body.c:551]: agregate_xmls(): while parsing
xml body message
17(148) ERROR: presence_xml [notify_body.c:156]: pres_agg_nbody(): while
aggregating body
17(148) exec: ***
cfgtrace:request_route=[kazoo:consumer-event-presence-dialog-update]
c=[//etc/kamailio/presence-role.cfg] l=276 a=26 n=xlog
17(148) INFO: <script>: 3O75Qw3gqR3ZNla5RfCgQLVW0-8KKbrT|log|finished
processing dialog update for sip:2...@rcsnet.ru state confirmed from
sip:217.12.247.98:11000 at 1506632313/1506632313/1506632313
Entity: line 1: parser error : Start tag expected, '<' not found
\x3c3f786d6c2076657273696f6e3d22312e302220656e636f64696e673d225554462d38223f3e3c
^
```
After some debugging i found that kamailio wants save to database xml string
like this as BLOB object
```
<?xml version="1.0" encoding="UTF-8"?><presence
xmlns="urn:ietf:params:xml:ns:pidf"
xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid"
xmlns:c="urn:ietf:params:xml:ns:pidf:cipid" entity="2496"> <tuple
xmlns="urn:ietf:params:xml:ns:pidf"
id="t8No1hQnp65U33jS1oqFMgxbIRPq-iFP"><status><basic>open</basic></status></tuple><note
xmlns="urn:ietf:params:xml:ns:pidf">On the Phone</note><dm:person
xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid"
id="1"><rpid:activities><rpid:on-the-phone/></rpid:activities><dm:note>On the
Phone</dm:note></dm:person></presence>
```
And later tries to read. But when this XML read reverse conversion of BLOB to
string is not take place. And late used BLOB as is. This breaks presentation
logic completely.
#### Reproduction
Configure kamailio on kazoo cluster to use PostgreSQL database
On phone create subscribe to second
>From second phone create new call.
#### Operating System
CentOS 7
Linux node2.docker.rcsnet.ru 3.10.0-514.16.1.el7.x86_64 #1 SMP Wed Apr 12
15:04:24 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
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https://github.com/kamailio/kamailio/issues/1255
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