escape TC message attrib for common selenium msg

turns:
[10:24:50][testing a failure] ##teamcity[testFailed name='testing a
failure' message='can't find element #cantfindme']
[10:24:50][testing a failure] Property value not found Valid property
list format is (name( )*=( )*'escaped_value'( )*)* where escape symbol
is "|"

into valid test/build failure msg:
[10:31:41][testing a failure] can't find element #cantfindme