Add $SEEDING_LOCK_TIMEOUT for high latency seeding

Seeding over a WAN can take longer than 10 minutes.
This allows the timeout to be increased temporarily.

https://bugzilla.redhat.com/show_bug.cgi?id=1422671

lib/evm_database.rb

@@ -63,10 +63,9 @@ def self.seed(classes = nil, exclude_list = [])
  classes ||= PRIMORDIAL_CLASSES + (seedable_model_class_names - PRIMORDIAL_CLASSES)
  classes -= exclude_list
 
+ lock_timeout = (ENV["SEEDING_LOCK_TIMEOUT"].presence || 10.minutes).to_i
  # Only 1 machine can go through this at a time
- # Populating the DB takes 20 seconds
- # Not populating the db takes 3 seconds
- MiqDatabase.with_lock(10.minutes) do
+ MiqDatabase.with_lock(lock_timeout) do
  classes.each do |klass|
  begin
  klass = klass.constantize if klass.kind_of?(String)
@@ -90,6 +89,9 @@ def self.seed(classes = nil, exclude_list = [])
  end
 
  _log.info("Seeding... Complete")
+ rescue Timeout::Error
+ _log.error("Timed out seeding database (#{lock_timeout} seconds).")
+ raise
  end
 
  def self.host