Keep default services enabled when enabling a GEO role

This adds support for roles specifing whether they manage services or not.

Roles that manage services cause the Default Role to be disabled when they are in use.

Roles that do not manage services, like our current Geo roles, don't cause the Default Role to be disabled.

Roles default to 'managing_services'

Fixes: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2818

added 4 commits

• f92a0f4d...90f403a2 - 3 commits from branch master
• e81306fb - Merge branch 'master' into 'geo-role-keep-default-services'

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approved this merge request

mentioned in commit 11e6dbfd

merged

Picked to stable branches.

mentioned in commit 340e18cd

removed Pick into Stable label

mentioned in commit b179300c