http proxy create location option support

[yanpliu]

Problem Statement

Fix the http proxy create without location can not find in Default Location
Realize http proxy create location option support

Test Cases: PASS

(robottelo_vv) [virtwho@dell-per740-68-vm-04 robottelo]$ pytest ./tests/foreman/virtwho/ui/test_esx.py -k test_positive_overview_label_name --disable-pytest-warnings -q
.                                                                                                                                                                                                           [100%]
1 passed, 33 deselected, 13 warnings in 120.91s (0:02:00)
2024-01-12 06:37:31 - robottelo - WARNING - missing grid_url or session_id. unable to clean video files.
(robottelo_vv) [virtwho@dell-per740-68-vm-04 robottelo]$ pytest ./tests/foreman/virtwho/ui/test_esx.py -k test_positive_proxy_option --disable-pytest-warnings -q
.                                                                                                                                                                                                           [100%]
1 passed, 33 deselected, 14 warnings in 250.38s (0:04:10)
2024-01-12 06:42:39 - robottelo - WARNING - missing grid_url or session_id. unable to clean video files.

(robottelo_vv) [virtwho@dell-per740-68-vm-04 robottelo]$ pytest ./tests/foreman/virtwho/api/test_esx.py -k test_positive_proxy_option --disable-pytest-warnings -q
.                                                                                                                                                                                                           [100%]
1 passed, 19 deselected, 10 warnings in 155.33s (0:02:35)
2024-01-12 07:10:29 - robottelo - WARNING - missing grid_url or session_id. unable to clean video files.
(robottelo_vv) [virtwho@dell-per740-68-vm-04 robottelo]$ pytest ./tests/foreman/virtwho/api/test_esx_sca.py -k test_positive_proxy_option --disable-pytest-warnings -q
.                                                                                                                                                                                                           [100%]
1 passed, 25 deselected, 10 warnings in 190.13s (0:03:10)
2024-01-12 07:18:12 - robottelo - WARNING - missing grid_url or session_id. unable to clean video files.
(robottelo_vv) [virtwho@dell-per740-68-vm-04 robottelo]$ pytest ./tests/foreman/virtwho/cli/test_esx.py -k test_positive_proxy_option --disable-pytest-warnings -q
.                                                                                                                                                                                                           [100%]
1 passed, 23 deselected, 10 warnings in 134.25s (0:02:14)
2024-01-12 07:20:52 - robottelo - WARNING - missing grid_url or session_id. unable to clean video files.
(robottelo_vv) [virtwho@dell-per740-68-vm-04 robottelo]$ pytest ./tests/foreman/virtwho/cli/test_esx_sca.py -k test_positive_proxy_option --disable-pytest-warnings -q
.                                                                                                                                                                                                           [100%]
1 passed, 37 deselected, 10 warnings in 218.61s (0:03:38)
2024-01-12 07:24:57 - robottelo - WARNING - missing grid_url or session_id. unable to clean video files.