HBASE-25879 [branch-1] Update CHANGES.txt and tag 1.7.0RC0 to the most recent commit

[Reidddddd]

No description provided.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	7m 2s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ branch-1 Compile Tests _
		_ Patch Compile Tests _
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+1 💚	asflicense	1m 28s	The patch does not generate ASF License warnings.
		11m 4s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3254/1/artifact/out/Dockerfile
GITHUB PR	#3254
Optional Tests	dupname asflicense
uname	Linux fe842090cd37 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-home/workspace/Base-PreCommit-GitHub-PR_PR-3254/out/precommit/personality/provided.sh
git revision	branch-1 / f312cfe
Max. process+thread count	41 (vs. ulimit of 10000)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3254/1/console
versions	git=1.9.1 maven=3.0.5
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