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Description of problem:

In a Satellite environment where it has 2k+ hypervisors, it takes 15+ minutes to call this api to get a list for pools which is considerably slow.

Version-Release number of selected component (if applicable):

candlepin-2.6.9-1.el7sat.noarch

How reproducible:

Easy

Steps to Reproduce:
1. set up a satellite server with 3k+ hypervisors. 
2. call the api

Actual results:

It takes 15min+ for the api to return all the pools.

Expected results:

It shouldn't take this long.

Verified in Satellite 6.7 Snap 16.

I pushed my system beyond 5k hypervisors and got the following results:

irb(main):005:0> Benchmark.bm{|x| x.report{ Katello::Pool.get_for_owner('Default_Organization') }}
       user     system      total        real
   6.281571   0.585320   6.866891 ( 10.714442)
=> [#<Benchmark::Tms:0x000000002103d600 @label="", @real=10.714441663003527, @cstime=0.0, @cutime=0.0, @stime=0.5853199999999994, @utime=6.281571, @total=6.866890999999999>]

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1454