Immediately actionable dependency upgrades

The immediately actionable items are:

• org.apache.logging.log4j:log4j-core in nifi-storm-spout 2.1 -> 2.8.2
• org.apache.poi:poi in nifi-email-processors 3.14 -> 3.15
• org.apache.logging.log4j:log4j-core in nifi-elasticsearch-5-processors 2.7 -> 2.8.2
• org.springframework:spring-web in nifi-jetty 4.2.4.RELEASE -> 4.3.10.RELEASE
• org.springframework:spring-web in nifi-jetty 4.2.4.RELEASE -> 4.3.10.RELEASE
• org.apache.derby:derby in nifi-kite-processors 10.11.1.1 -> 10.12.1.1 (already excluded)
• com.fasterxml.jackson.core:jackson-core in nifi-azure-processors 2.6.0 -> 2.8.6
• com.fasterxml.jackson.core:jackson-core in nifi-expression-language 2.6.1 -> 2.8.6
• com.fasterxml.jackson.core:jackson-core in nifi-standard-utils 2.6.2 -> 2.8.6
• com.fasterxml.jackson.core:jackson-core in nifi-hwx-schema-registry 2.7.3 -> 2.8.6
• com.fasterxml.jackson.core:jackson-core in nifi-solr-processors 2.5.4 -> 2.8.6