Fix BaseException.message DeprecationWarning

https://review.openstack.org/#/c/32154/ introduces a deprecated
TypeError.message reference, which won't work in python3 and
causes a DeprecationWarning to be output on >= python 2.6

Change-Id: Ibd11d4ad6b82e96ede8f38fe76112bd71e98c5c9
Do not refresh timestamp from database on read.

Doing a database refresh on timestamp read is causing errors
such as:
heat.openstack.common.rpc.amqp InvalidRequestError:
  Could not refresh instance '<Stack at 0x2c95a90>'

This has only been seen using postgres, possibly because the problem is
being masked on mysql due to the driver's lack of concurrency.

The database refresh seems to be unnecessary, as there appears to be
no logic which depends on timestamps being accurate (nor is there
any timestamp comparison logic at all)

Fixes bug: #1193132
Change-Id: I22c3c4546a0f44b76a95e473b68b6fbb2e423b90
Give alarm a physical_resource_name which need no id.

This restores previous behaviour, including workarounds for
circular dependencies.

Fixes bug: #1192814

Change-Id: I33e8e4d7806fb397553944dbd6ebb85b575b9cb5
Merge "Fix BaseException.message DeprecationWarning"
Merge "Give alarm a physical_resource_name which need no id."