Revert SSHD config change. (sonic-net#12729)

Revert SSHD config change.

#### Why I did it
Some test case and code may impact by SSHD config change.


#### How I did it
Revert following change in build_debian.sh script:
ClientAliveInterval change back to 900.
MaxAuthTries change back to default value.
Banner change to disabled.

#### How to verify it
Pass all E2E test case.

#### Which release branch to backport (provide reason below if selected)

<!--
- Note we only backport fixes to a release branch, *not* features!
- Please also provide a reason for the backporting below.
- e.g.
- [x] 202006
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- [ ] 201811
- [ ] 201911
- [ ] 202006
- [ ] 202012
- [ ] 202106
- [ ] 202111
- [ ] 202205

#### Description for the changelog
Revert SSHD config change.

#### Link to config_db schema for YANG module changes
<!--
Provide a link to config_db schema for the table for which YANG model
is defined
Link should point to correct section on https://github.com/Azure/sonic-buildimage/blob/master/src/sonic-yang-models/doc/Configuration.md
-->

#### A picture of a cute animal (not mandatory but encouraged)

Author: liuh-80

build_debian.sh

@@ -468,16 +468,12 @@ rm /files/etc/ssh/sshd_config/ClientAliveInterval
 rm /files/etc/ssh/sshd_config/ClientAliveCountMax
 touch /files/etc/ssh/sshd_config/EmptyLineHack
 rename /files/etc/ssh/sshd_config/EmptyLineHack ""
-set /files/etc/ssh/sshd_config/ClientAliveInterval 300
+set /files/etc/ssh/sshd_config/ClientAliveInterval 900
 set /files/etc/ssh/sshd_config/ClientAliveCountMax 0
 ins #comment before /files/etc/ssh/sshd_config/ClientAliveInterval
-set /files/etc/ssh/sshd_config/#comment[following-sibling::*[1][self::ClientAliveInterval]] "Close inactive client sessions after 5 minutes"
-rm /files/etc/ssh/sshd_config/MaxAuthTries
-set /files/etc/ssh/sshd_config/MaxAuthTries 3
+set /files/etc/ssh/sshd_config/#comment[following-sibling::*[1][self::ClientAliveInterval]] "Close inactive client sessions after 15 minutes"
 rm /files/etc/ssh/sshd_config/LogLevel
 set /files/etc/ssh/sshd_config/LogLevel VERBOSE
-rm /files/etc/ssh/sshd_config/Banner
-set /files/etc/ssh/sshd_config/Banner /etc/issue
 save
 quit
 EOF