baremetal: Integrate provisioning and non-provisioning interfaces

Originally, baremetal pxe/tilera driver managed two types of network
interfaces in two tables; provisioning interfaces in bm_nodes table
and non-provisioning (normal) interfaces in bm_interfaces table.
But, now actually both types are handled in the same way and there is
no difference between them except for which table they are in.

This patch moves the provisioning interfaces to bm_interfaces. However
it does not drop prov_mac_address in bm_nodes since VirtualPowerManager
still uses it to identify a target in a list of VMs returned by the
VM's host.

Change-Id: I5ce940e7127aa3b29ba7802612938dc5dbc3152f
set timeout for paramiko ssh connection

set powervm connection timeout to 60 seconds
to eliminate crashing if ssh server is slow in
responding.

Change-Id: Ic7f4d092de73e73c6edb909713bf3a2347a50334
Fix error message in pre_live_migration.

We are using locals() to reference a variable which doesn't exist
in this error message. Also rename the instance variable while I
am here to be more consistent with other uses.

Resolves bug 1164072.

Change-Id: I96f5e2a81ac2e97181c3e87df83e19b381f4bcd2
Imported Translations from Transifex

Change-Id: I91007468d2da94bb669931ad09dce4c2f5d3efad
Fix typo: libvir => libvirt

Fix in fakelibvirt test

Change-Id: I7969df6e04808f5c14386d197b73c6d9a1c7dd44
Replace metadata joins with another query

Right now, we always join metadata and system_metadata when we query for
instances. This inflates the number of rows returned by a factor of ten
at a minimum, and over 30 in some situations. This patch avoids the
direct join of these tables in favor of a "manual join" which performs
additional queries to fill the needed data. Latency may be increased,
but with the gain of a potentially significant amount of reduction in
data transfer.

This also provides the ability for the queries which utilize it to
selectively decide whether either or both of these additional fills are
performed, paving the way for future high-level optimizations.

Related to bug 1164737

Change-Id: I0610fb16ccce2ee95c318589c8abcc30613a3fe9
Change DB API instance functions for selective metadata fetching

This makes the DB API for instance_get_all() variants able to take a
columns_to_join parameter like the base instance_get_all() function,
which provides control over whether we go to the trouble of pulling
the metadata out of the database before we return the instances.

Related to bug 1164737

Change-Id: Ie7c012e2e12bb91ef4294cdc90d828af255b67c5
Optimize some of the periodic task database queries in n-cpu

There are a few trivial periodic tasks that can benefit from telling
the DB API (via conductor) not to fetch metadata items. This patch
makes those changes

Related to bug 1164737

Change-Id: I8e2730d3ed74bd7e0a0217647316c1cf492f22f3
Merge "Fix typo: libvir => libvirt"
Merge "Imported Translations from Transifex"
Merge "Fix error message in pre_live_migration."
Merge "baremetal: Integrate provisioning and non-provisioning interfaces"
Merge "set timeout for paramiko ssh connection"
Don't hide stacktraces for unexpected errors in rescue

Prevent rescue commands from hiding stacktraces for unexpected errors.
Before this the wrap_errors function would catch unexpected errors and
hide them, with a generic HTTPInternalServerError without any
stacktrace.

Change-Id: I80e0ae8257117a3e5a4c946b38870aad0e58cc12
Merge "Replace metadata joins with another query"
Merge "Change DB API instance functions for selective metadata fetching"
Merge "Optimize some of the periodic task database queries in n-cpu"
Merge "Don't hide stacktraces for unexpected errors in rescue"