Only Enable non-root mlock capability if variable 'vault_disable_mlock' is true

[ron1]

Only Enable non-root mlock capability if variable 'vault_disable_mlock' is true. Currently, the following two tasks are executed needlessly when 'vault_disable_mock' is true.

ansible-vault/tasks/main.yml

Line 78 in 7e2fded

- name: Check Vault mlock capability

ansible-vault/tasks/main.yml

Line 85 in 7e2fded

- name: Enable non root mlock capability

This is related to issue: #287.