Allow setting parameters on the API and Content Apache proxy

[ehelms]

Adds a default timeout of 5 minutes to the parameters to address
issues seen when syncing from a Pulp 3 to a Pulp 3 mirror.

The default proxy timeout is 60 seconds, and we have seen in nightly, proxy syncing fail right at the one minute mark. This is a bit of tuning problem so I figured let's start with a higher default of 5 minutes and monitor.

[ehelms]

Example failure:

10:31:48  # (in test file fb-katello-proxy.bats, line 26)
10:31:48  #   `hammer capsule content synchronize --id=$PROXY_ID' failed with status 70
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.0/1, 0%, elapsed: 00:00:00
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.0/1, 0%, 0.0/s, elapsed: 00:00:02
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.0/1, 0%, 0.0/s, elapsed: 00:00:04
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.07/1, 7%, 0.0/s, elapsed: 00:00:06, ETA: 00:01:32
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:09, ETA: 00:01:24
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:11, ETA: 00:01:45
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:13, ETA: 00:02:06
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:15, ETA: 00:02:06
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:18, ETA: 00:02:06
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:20, ETA: 00:07:18
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:22
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:25
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:27
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:29
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:32
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:35
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:37
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:39
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:41
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.1/1, 10%, 0.0/s, elapsed: 00:00:44
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.17/1, 17%, 0.0/s, elapsed: 00:00:47, ETA: 00:02:44
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.17/1, 17%, 0.0/s, elapsed: 00:00:49, ETA: 00:02:44
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.49/1, 49%, 0.0/s, elapsed: 00:00:51, ETA: 00:00:18
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.49/1, 49%, 0.0/s, elapsed: 00:00:54, ETA: 00:00:18
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.49/1, 49%, 0.0/s, elapsed: 00:00:56, ETA: 00:00:18
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced running: 0.55/1, 55%, 0.0/s, elapsed: 00:00:58, ETA: 00:00:15
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced warning: 1.0/1, 100%, 0.0/s, elapsed: 00:01:01
10:31:48  # Task af4481c5-01ea-421a-88e5-c2da4d35bced warning: 1.0/1, 100%, 0.0/s, elapsed: 00:01:01
10:31:48  # Error: RPM1004: Error retrieving metadata: Error 'Proxy Error' for https://pipe-up-katello-nightly-centos7.n45.example.com/pulp/repos/Test_Organization/Library/Composite/custom/Test_Product/Zoo/repodata/f0b5cbda6294f1b484c862127f504daaa68efcbd1060dfb7ab48c7b9dba5154d-other.xml.gz.