Handle P-Associated-Uris which are SIP uris in conference host check.

When checking whether a CEP participant is the host device, we previously assumed the P-Associated-Uri entries were just tel URIs. Although in practice this has worked so far, there are some carriers where the mix of P-Associated-Uri entries is JUST a list of SIP URIs, with none being a TEL URI.

This change assumes the P-Associated-Uri can also be SIP URIs and adds
tests to confirm behavior in the existing and newly identified cases.

Test: 1.Pass TMO lab test cases.
      2.Pass FET live network.
Fixes: 172638214
Change-Id: I83df998c655ab61246432e846b76b648a5526d79
Merged-In: I72038fd3fbe418f9d5d026a2fae688bc0d381531
2 files changed