Update vue component naming guidelines
What does this MR do?
Update vue component naming guidelines to follow vue's style guide for multi-word component names (https://vuejs.org/v2/style-guide/#Multi-word-component-names-essential) and eslint plugin rules (https://github.com/vuejs/eslint-plugin-vue)
Are there points in the code the reviewer needs to double check?
What are the relevant issue numbers?
No relevant issue. See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16948#note_58258168.
Edited by George Tsiolis