update version to 2.6.3-SNAPSHOT
Merge pull request #107 from sonatype/nexus-5849-artifactory-autorouting

NEXUS-5849: Central prefix file is served through Artifactory, which results in non-central artifacts being blocked
Conflicts:
	components/nexus-core/src/main/java/org/sonatype/nexus/proxy/maven/routing/internal/PropfileDiscoveryStatusSource.java
	components/nexus-core/src/main/java/org/sonatype/nexus/proxy/maven/routing/internal/RemotePrefixFileStrategy.java
	components/nexus-core/src/main/java/org/sonatype/nexus/proxy/maven/routing/internal/RemoteScrapeStrategy.java
	components/nexus-core/src/test/java/org/sonatype/nexus/proxy/maven/routing/internal/RemoteContentDiscovererImplTest.java
	components/nexus-core/src/test/java/org/sonatype/nexus/proxy/maven/routing/internal/RemoteScrapeStrategyTest.java
NEXUS-5849: Wrong condition to detect address element

Original code had a bug, an exclamation mark that
negated condition to recognize remote server.

This change fixed that, but also improves code a
bit making it more resilient to empty or null
address tags, and also comparing test against
lowered case.
NEXUS-5849: Using fixed locale for toLowerCase() call
Merge pull request #97 from sonatype/nexus-5828-security-manager-upgrade

NEXUS-5828: Upgrade step for security manager
Conflicts:
	components/nexus-core/src/test/java/org/sonatype/nexus/configuration/ClearPasswordTest.java
	components/nexus-core/src/test/java/org/sonatype/nexus/configuration/application/source/FileConfigurationSourceTest.java
	components/nexus-core/src/test/java/org/sonatype/nexus/proxy/maven/routing/internal/RemoteScrapeStrategyTest.java
	components/nexus-core/src/test/java/org/sonatype/nexus/proxy/repository/validator/AbstractFileTypeValidationUtilTest.java
	components/nexus-core/src/test/java/org/sonatype/scheduling/DefaultTaskConfigManagerTest.java
	components/nexus-ldap-common/src/test/java/org/sonatype/security/ldap/LdapTestSupport.java
	components/nexus-security/src/main/java/org/sonatype/security/DefaultSecuritySystem.java
	components/nexus-security/src/main/java/org/sonatype/security/configuration/DefaultSecurityConfigurationManager.java
	components/nexus-security/src/main/java/org/sonatype/security/configuration/SecurityConfigurationManager.java
	components/nexus-security/src/main/java/org/sonatype/security/configuration/upgrade/Upgrade203to204.java
	plugins/basic/nexus-timeline-plugin/src/test/java/org/sonatype/nexus/timeline/LegacyNexusTimelineTest.java
	plugins/maven/nexus-archetype-plugin/src/test/java/org/sonatype/nexus/plugins/mac/AbstractMacPluginTest.java