update SpringBoot to 2.1.9

Also remove direct dependencies to log4j-api and log4j-core where
possible. log4j-slf4j-impl is enough in many cases.

block-storage/build.gradle

@@ -5,7 +5,7 @@ dependencies {
 	compile project(':file-utils')
 	compile project(':pdb-utils')
 	
-	compile lib_log4j2_core
+	
 	compile lib_log4j2_slf4j_impl
     compile lib_primitive_collections
 }

build.gradle

@@ -20,7 +20,7 @@ buildscript {
 ext {
     
     version_log4j2= '2.12.1'
-    version_spring = '2.1.8.RELEASE'
+    version_spring = '2.1.9.RELEASE'
     
     lib_antlr = "org.antlr:antlr4:4.7.2"
     
@@ -28,7 +28,6 @@ ext {
     lib_commons_lang3 = 'org.apache.commons:commons-lang3:3.9'
     lib_jackson_databind = 'com.fasterxml.jackson.core:jackson-databind:2.10.0'
     
-    lib_log4j2_api = "org.apache.logging.log4j:log4j-api:${version_log4j2}"
     lib_log4j2_core = "org.apache.logging.log4j:log4j-core:${version_log4j2}"
     lib_log4j2_slf4j_impl = "org.apache.logging.log4j:log4j-slf4j-impl:${version_log4j2}"
     

byte-utils/build.gradle

@@ -1,5 +1,4 @@
 dependencies {
-	compile lib_log4j2_core
 	compile lib_log4j2_slf4j_impl
     compile lib_primitive_collections
 }

data-store/build.gradle

@@ -10,7 +10,6 @@ dependencies {
 	compile lib_primitive_collections
 	compile lib_commons_lang3
 
-    compile lib_log4j2_core
     compile lib_log4j2_slf4j_impl
 }
 

file-utils/build.gradle

@@ -1,6 +1,3 @@
 dependencies {
-	
-
-	compile lib_log4j2_core
 	compile lib_log4j2_slf4j_impl
 }

performanceDb/build.gradle

@@ -6,7 +6,6 @@ dependencies {
 	compile lib_jackson_databind
 	compile lib_commons_collections4
 	
-	compile lib_log4j2_api
 	compile lib_log4j2_core
 	compile lib_log4j2_slf4j_impl
 }