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This PR disables the automatic retrying of Utils/http_request() that was skipping certificate validation.

The new default is to produce a hard error on certificate errors.

This PR also adds a new --insecure flag to the cli update command that turns this retrying back on when explicitly requested, which allows manually going back to the previous behavior.

Subsequent PRs on the command repositories will add a similar --insecure flag to the appropriate commands on the following repositories:

• wp-cli/config-command => Add --insecure flag to config create & config shuffle-salts commands config-command#128
• wp-cli/core-command => Add --insecure flag to core download & core update commands core-command#186
• wp-cli/extension-command => Add --insecure flag to plugin|theme install & plugin\theme update commands extension-command#287
• wp-cli/checksum-command => Add --insecure flag to core|plugin verify-checksums commands checksum-command#86
• wp-cli/package-command => Add --insecure flag to package install command package-command#138

Add --insecure flag to config create & config shuffle-salts commands wp-cli/config-command#128

Add --insecure flag to core download & core update commands wp-cli/core-command#186

Add --insecure flag to plugin|theme install & plugin\theme update commands wp-cli/extension-command#287

Add --insecure flag to core|plugin verify-checksums commands wp-cli/checksum-command#86

Add --insecure flag to package install command wp-cli/package-command#138

Add "insecure" option to http_request()

9c53e5d

Refactor logic to read insecure option

cc9c7f4

Adapt test with new expected behavior

69d7732

Add --insecure flag to cli update command

b5b926a

Ensure loggers are only used if they exist

b4c4076

Fix tests

8cd9142

Add $insecure argument to get_upgrader() helper function

db59411

Ensure $insecure flag is only added on constructors that support it

69a352b