Fix publication of EC2 host address in DefaultConnectivityResolver

[sjcorbett]

Publish Attributes.ADDRESS before guessing the EC2 hostname.
Fixes the case where host.address was set to the FQDN in EC2.

[Graeme-Miller]

Tested locally, works as expected:

[sjcorbett]

The Jenkins failure was due to the environment:

Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000d0000000, 536870912, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 536870912 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /home/jenkins/jenkins-slave/workspace/brooklyn-server-pull-requests/core/hs_err_pid31046.log

[aledsage]

LGTM; merging.