ACCUMULO-2285 Default to MASTER1 if tracers or gc file is missing (1.4.x)

The start-all.sh script defaults to starting tracer and gc processes on the first
master if the tracers and gc files are missing from ACCUMULO_CONF_DIR. This change
adds that default behavior to stop-all.sh, which otherwise does not stop the
processes.
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT (-sours)
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
Revert "ACCUMULO-2096 Clean up the security RW tests."

This reverts commit 9f59c0022777fc86d0b269d064bcc898b27c9b23.

Conflicts:
	test/src/main/java/org/apache/accumulo/test/randomwalk/security/Validate.java
Revert "ACCUMULO-2087 ACCUMULO-2086 Fixing formatting."

This reverts commit 0d294ad64ed5a12c44e1c33bc5561897e3aef512.
Revert "ACCUMULO-2086 Use the tableID instead of the tableName where necessary."

This reverts commit e8c9aae904380f22e55a31e3a7422ecd4597b0b0.
ACCUMULO-1479 Simplification of namespace support in SecurityOperation
ACCUMULO-2260 removing table config copy test
ACCUMULO-1479 ACCUMULO-2086 ACCUMULO-2096 refactoring namespace translation out of security operations to fix security randomwalk
ACCUMULO-2289 Correcting Tables.getNamespace to Tables.getNamespaceId
ACCUMULO-2293 Check the correct SecurityErrorCode on ThriftSecurityException in the _flush method
ACCUMULO-2086 ACCUMULO-2096 ACCUMULO-2286 Some more initial namespace support
ACCUMULO-2295 adjusting test timeouts
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	core/src/main/java/org/apache/accumulo/core/client/admin/TableOperationsImpl.java
Merge branch '1.6.0-SNAPSHOT' of https://git-wip-us.apache.org/repos/asf/accumulo into 1.6.0-SNAPSHOT
ACCUMULO-2220 supporting ACCUMULO_CONF_DIR in test/system/bench
Merge remote-tracking branch 'origin/1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT
Merge remote-tracking branch 'origin/1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-1917 adding ClientConfiguration javadoc
ACCUMULO-2298 chunking up ExamplesIT