fix: LDAP constants used in some LdapAuth settings are parsed as stri…

[righel]

…ngs silently failing to do what they are supposed to

Add a utility function to parse php constants and write the integer value in the MISP config.

Current settings in template.env:

LDAPAUTH_LDAPTLSREQUIRECERT="LDAP_OPT_X_TLS_ALLOW"
LDAPAUTH_LDAPTLSCRLCHECK="LDAP_OPT_X_TLS_CRL_PEER"
LDAPAUTH_LDAPTLSPROTOCOLMIN="LDAP_OPT_X_TLS_PROTOCOL_TLS1_2"

Produce:

'ldapTlsRequireCert' => 'LDAP_OPT_X_TLS_ALLOW',
'ldapTlsCrlCheck' => 'LDAP_OPT_X_TLS_CRL_PEER',
'ldapTlsProtocolMin' => 'LDAP_OPT_X_TLS_PROTOCOL_TLS1_2',

Instead of:

'ldapTlsRequireCert' => 3, // LDAP_OPT_X_TLS_ALLOW
'ldapTlsCrlCheck' => 1, // LDAP_OPT_X_TLS_CRL_PEER
'ldapTlsProtocolMin' => 771, // LDAP_OPT_X_TLS_PROTOCOL_TLS1_2