solve jar conflict, delete servlet-api 2.5 jar (#1966)

* update README about DolphinScheduler

* Update issue templates

* update

* regularize api pom xml
update rpc maven compile to 1.8

* regularize api pom xml

* change commons.lang3.StringUtils to common.utils.StringUtils

* update pom.xml

* update

* correct equals method

* jasper-runtime is needed when api server start

* jasper-runtime jar is needed when api server start

* combine logback config of master/worker/alert/api server to one logback.xml

* remove tomcat runtime jar

* add UT

* add license

* remove jasper-runtime jar, not need anymore

* sovle jar conflict， remove servlet-api 2.5 jar

* remove servlet 2.5
Co-authored-by: NDS <escheduler@outlook.com>

dolphinscheduler-api/pom.xml

@@ -146,6 +146,12 @@
     <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-common</artifactId>
+      <exclusions>
+        <exclusion>
+          <groupId>javax.servlet</groupId>
+          <artifactId>servlet-api</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
 
     <dependency>
@@ -156,11 +162,23 @@
     <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-hdfs</artifactId>
+      <exclusions>
+        <exclusion>
+          <artifactId>servlet-api</artifactId>
+          <groupId>javax.servlet</groupId>
+        </exclusion>
+      </exclusions>
     </dependency>
 
     <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-yarn-common</artifactId>
+      <exclusions>
+        <exclusion>
+          <artifactId>servlet-api</artifactId>
+          <groupId>javax.servlet</groupId>
+        </exclusion>
+      </exclusions>
     </dependency>
 
     <dependency>
@@ -168,14 +186,15 @@
       <artifactId>hadoop-aws</artifactId>
     </dependency>
 
-    <dependency>
-      <groupId>javax.servlet</groupId>
-      <artifactId>servlet-api</artifactId>
-    </dependency>
-
     <dependency>
       <groupId>org.mortbay.jetty</groupId>
       <artifactId>jsp-2.1</artifactId>
+      <exclusions>
+        <exclusion>
+          <groupId>org.mortbay.jetty</groupId>
+          <artifactId>servlet-api-2.5</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
 
     <!-- just for test -->

dolphinscheduler-common/pom.xml

@@ -246,11 +246,6 @@
 			</exclusions>
 		</dependency>
 
-		<dependency>
-			<groupId>javax.servlet</groupId>
-			<artifactId>javax.servlet-api</artifactId>
-		</dependency>
-
 		<dependency>
 			<groupId>org.apache.hadoop</groupId>
 			<artifactId>hadoop-hdfs</artifactId>