Add a connection timeout for remote region connections

This will prevent a non-responsive remote region from hanging
the UI when trying to query for the replication backlog.

Regular ruby Timeout won't work here because the PG connection code
doesn't respond to the exception until after it has exhausted the
underlying libpq timeout logic.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1796681

app/models/miq_region_remote.rb

@@ -78,7 +78,7 @@ def self.connection_parameters_for(config)
     return host, port, username, password, database, adapter
   end
 
-  def self.with_remote_connection(host, port, username, password, database, adapter)
+  def self.with_remote_connection(host, port, username, password, database, adapter, connect_timeout = 0)
     # Don't allow accidental connections to localhost.  A blank host will
     # connect to localhost, so don't allow that at all.
     host = host.to_s.strip
@@ -92,12 +92,13 @@ def self.with_remote_connection(host, port, username, password, database, adapte
 
     begin
       pool = establish_connection({
-        :adapter  => adapter,
-        :host     => host,
-        :port     => port,
-        :username => username,
-        :password => password,
-        :database => database
+        :adapter         => adapter,
+        :host            => host,
+        :port            => port,
+        :username        => username,
+        :password        => password,
+        :database        => database,
+        :connect_timeout => connect_timeout
       }.delete_blanks)
       conn = pool.connection
       yield conn

app/models/pglogical_subscription.rb

@@ -261,12 +261,12 @@ def decrypted_password
   end
 
   def remote_region_lsn
-    with_remote_connection(&:xlog_location)
+    with_remote_connection(5.seconds) { |conn| conn.xlog_location }
   end
 
-  def with_remote_connection
+  def with_remote_connection(connect_timeout = 0)
     find_password
-    MiqRegionRemote.with_remote_connection(host, port || 5432, user, decrypted_password, dbname, "postgresql") do |conn|
+    MiqRegionRemote.with_remote_connection(host, port || 5432, user, decrypted_password, dbname, "postgresql", connect_timeout) do |conn|
       yield conn
     end
   end