Report proper error message in PLUMgrid Plugin

Change-Id: Ifc1bb55f6b025bba77cf9858ed392dbf170075a7
Closes-Bug: #1268460
Signed-off-by: Fawad Khaliq <fawad@plumgrid.com>
Minimize the cost of checking for api worker exit

A recent change to oslo allows the configuration of the interval
that ProcessLauncher waits between checks of child exit.  The
default interval of 0.01s resulted in the neutron service consuming
unnecessary cpu cycles checking whether api workers had exited (5%
cpu on idle in a VM).  This patch extends the interval to 1s to
minimize the cost of the checks.

Change-Id: I0407ccb2db65cd3839586faff15e70dbc35f005e
Closes-bug: #1095346
Sync with commit-id: 9d529dd324d234d7aeaa3e6b4d3ab961f177e2ed

(Pulling from the gate, neutron fail rates are currently too high
to have neutron jobs in the queue.)

Related-Bug: #1270212
Change-Id: I94965b395cfb34ed1576b84f21aa48edf991d629
Imported Translations from Transifex

Change-Id: I5d64e7d935354693146ac58bfe2d0b0ad04a7c24
Merge "Imported Translations from Transifex"
Merge "Report proper error message in PLUMgrid Plugin"
Imported Translations from Transifex

Change-Id: Iabfa4ccf4cfa145630fb5044bdeed76acb29ba6e
Merge "Minimize the cost of checking for api worker exit"