10058: Tablerate->getCsvFile() fails with non-default PHP upload_tmp_…

[dmanners]

…dir(2.3)

Description

Port of #12376

Fixed Issues (if relevant)

1. Tablerate->getCsvFile() fails with non-default PHP upload_tmp_dir #10058: Tablerate->getCsvFile() fails with non-default PHP upload_tmp_dir

Manual testing scenarios

1. Make a new directory for uploads, eg mkdir -p /var/lib/php/uploads && chmod 1777 /var/lib/php/uploads
2. Set PHP upload_tmp_dir to this directory. eg, add upload_tmp_dir = /var/lib/php/uploads to /etc/php.ini
3. Login to Magento Admin
4. Go to Stores > Configuration > Sales > Shipping Methods
5. Select Table Rates, and enable
6. Click "Import"
7. Choose a file, click save.

Expected result

Table rates are updated

Actual result

Receive an error, eg The file “/tmp/var/lib/php/uploads/phphEpJe5” doesn’t exist

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)