HBASE-26153 [create-release] Use cmd-line defined env vars

[saintstack]

Allow defining the below on the command-line (previously you
could not):
RC_COUNT
RELEASE_TAG
GPG_KEY
Adds an edit of the usage.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 5s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+0 🆗	shelldocs	0m 0s	Shelldocs was not available.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
+0 🆗	mvndep	0m 16s	Maven dependency ordering for branch
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 6s	Maven dependency ordering for patch
+1 💚	shellcheck	0m 3s	There were no new shellcheck issues.
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+0 🆗	asflicense	0m 0s	ASF License check generated no output?
		2m 40s

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-3542/3/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#3542
Optional Tests	dupname asflicense shellcheck shelldocs
uname	Linux 4da8210b855f 4.15.0-128-generic #131-Ubuntu SMP Wed Dec 9 06:57:35 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / f3175c5
Max. process+thread count	45 (vs. ulimit of 30000)
modules	C: U:
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3542/3/console
versions	git=2.17.1 maven=3.6.3 shellcheck=0.4.6
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

This message was automatically generated.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	9m 53s	Docker mode activated.
-0 ⚠️	yetus	0m 3s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+0 🆗	mvndep	0m 17s	Maven dependency ordering for branch
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 7s	Maven dependency ordering for patch
		_ Other Tests _
		11m 16s

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-3542/3/artifact/yetus-jdk8-hadoop3-check/output/Dockerfile
GITHUB PR	#3542
Optional Tests
uname	Linux 5a527898fd74 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / f3175c5
Max. process+thread count	51 (vs. ulimit of 30000)
modules	C: U:
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3542/3/console
versions	git=2.17.1 maven=3.6.3
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

This message was automatically generated.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	10m 16s	Docker mode activated.
-0 ⚠️	yetus	0m 3s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+0 🆗	mvndep	0m 16s	Maven dependency ordering for branch
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 7s	Maven dependency ordering for patch
		_ Other Tests _
		11m 42s

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-3542/3/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#3542
Optional Tests
uname	Linux cb348181b09a 4.15.0-143-generic #147-Ubuntu SMP Wed Apr 14 16:10:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / f3175c5
Max. process+thread count	47 (vs. ulimit of 30000)
modules	C: U:
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3542/3/console
versions	git=2.17.1 maven=3.6.3
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

This message was automatically generated.