#344 Fix incorrect admin user auth key regeneration

[UFOSmuggler]

This closes #344 by checking whether or not a valid auth key exists for user 1.

We do SELECT EXISTS(SELECT 1 FROM auth_keys WHERE user_id = 1 AND (expiration = 0 OR expiration > UNIX_TIMESTAMP())); which checks for non-expiring and non-expired auth keys for user 1, and returns 0 or 1 based on whether there is a valid auth key.

If there is a valid auth key, we skip regeneration and emit a log line.

There appears to be no cake console command to check the existence of a valid auth key (we can test keys, but not see if a valid one exists) so checking the DB seems to be the way to go.

valid key exists:

misp-core-1  | Enforcing initialisation setting 'MISP.contact' to env var or default value 'admin@admin.test'...
misp-core-1  | Enforcing initialisation setting 'MISP.email' to env var or default value 'admin@admin.test'...
misp-core-1  | Enforcing gpg setting 'GnuPG.email' to env var or default value 'admin@admin.test'...
misp-core-1  | ... valid admin key for admin user found, not changing

no valid key exists:

misp-core-1  | Enforcing initialisation setting 'MISP.contact' to env var or default value 'admin@admin.test'...
misp-core-1  | Enforcing initialisation setting 'MISP.email' to env var or default value 'admin@admin.test'...
misp-core-1  | Enforcing gpg setting 'GnuPG.email' to env var or default value 'admin@admin.test'...
misp-core-1  | ... regenerating admin key (set $ADMIN_KEY if you want it to change)
misp-core-1  | ... admin user key set to 'UeIKSNF8X2oQ1FFGA3Xxvdwt4NKqJIO3vH6n6HpD'