Add myportfolio.com to yellowlist

[ghostwords]

To unbreak Adobe Portfolio-powered sites for users logged into myportfolio.com.

Appears to be one of those cases where a website sets login/session cookies in the first-party context while also serving static resources in third-party contexts using domains that receive the previously set login cookies.

Error report counts by page domain and exact blocked subdomain:

+------------------------------+-------------------------------------+-------+
| fqdn                         | blocked_fqdn                        | count |
+------------------------------+-------------------------------------+-------+
| adrenaline.de                | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| amstudio.rocks               | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| claudiahaon.com              | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| dantaylr.com                 | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| jeffreyphillips.com.au       | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| joenisbett.com               | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| krisblackmore.com            | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| nickliphotos.com             | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| robertsrurans.com            | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
...

Error report counts by date and exact blocked subdomain:

+---------+-------------------------------------+-------+
| ym      | blocked_fqdn                        | count |
+---------+-------------------------------------+-------+
| 2018-04 | pro2-bar-s3-cdn-cf.myportfolio.com  |     1 |
| 2018-04 | pro2-bar-s3-cdn-cf1.myportfolio.com |     1 |
| 2018-04 | pro2-bar-s3-cdn-cf2.myportfolio.com |     1 |
| 2018-04 | pro2-bar-s3-cdn-cf3.myportfolio.com |     1 |
| 2018-04 | pro2-bar-s3-cdn-cf4.myportfolio.com |     1 |
| 2018-04 | pro2-bar-s3-cdn-cf5.myportfolio.com |     1 |
| 2018-04 | pro2-bar-s3-cdn-cf6.myportfolio.com |     1 |
| 2018-03 | pro2-bar-s3-cdn-cf.myportfolio.com  |     4 |
| 2018-03 | pro2-bar-s3-cdn-cf1.myportfolio.com |     3 |
| 2018-03 | pro2-bar-s3-cdn-cf2.myportfolio.com |     4 |
| 2018-03 | pro2-bar-s3-cdn-cf3.myportfolio.com |     3 |
| 2018-03 | pro2-bar-s3-cdn-cf4.myportfolio.com |     3 |
| 2018-03 | pro2-bar-s3-cdn-cf5.myportfolio.com |     3 |
| 2018-03 | pro2-bar-s3-cdn-cf6.myportfolio.com |     4 |
| 2018-02 | pro2-bar-s3-cdn-cf1.myportfolio.com |     1 |
| 2018-02 | pro2-bar-s3-cdn-cf2.myportfolio.com |     1 |
| 2018-02 | pro2-bar-s3-cdn-cf4.myportfolio.com |     1 |
| 2018-02 | pro2-bar-s3-cdn-cf6.myportfolio.com |     1 |
...

[ghostwords]

Previously: #1922.

Probably related: #1545 (comment).

[bcyphers]

Looks good.