Sanitize user inputs or replace `sed` usage

[fhennig]

Two places:

hive-operator/rust/operator-binary/src/command.rs

Line 47 in 5f9d0b7

format!("sed -i \"s|{ACCESS_KEY_PLACEHOLDER}|$(cat {S3_SECRET_DIR}/{S3_ACCESS_KEY})|g\" {STACKABLE_CONFIG_DIR}/{HIVE_SITE_XML}"),

hive-operator/rust/operator-binary/src/kerberos.rs

Line 95 in 5f9d0b7

sed -i -e 's/${{env.KERBEROS_REALM}}/'\"$KERBEROS_REALM/g\" {STACKABLE_CONFIG_DIR}/{HIVE_SITE_XML}",