Add invalid XML event
Merge pull request #33 from Metaswitch/invalid_xml

[Reviewer: Andy] Add invalid XML event
Reserve event ID 0x810027 for I-CSCF=>I-CSCF loop
Merge pull request #34 from Metaswitch/sl_reserve_sas_log_id

Reserve event ID 0x810027 for I-CSCF=>I-CSCF loop
Add SAS log IDs
Merge branch 'nj2_tmp' of github.com:metaswitch/clearwater-sas-resources into nj2_tmp