Improve SSHD config to use more secure settings (#12109)

Improve SSHD config to use more secure settings

#### Why I did it
According to Sonic OS review result, SSHD config file /etc/ssh/sshd_config using insecure settings.


#### How I did it
Change build_debian.sh script to set following settings to /etc/ssh/sshd_config:
ClientAliveInterval is set to 300
MaxAuthTries is set to default of 3
Banner set to /etc/issue
LogLevel is set to VERBOSE

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

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

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- Please also provide a reason for the backporting below.
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- [x] 202006
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- [ ] 201811
- [ ] 201911
- [ ] 202006
- [ ] 202012
- [ ] 202106
- [ ] 202111
- [ ] 202205

#### Description for the changelog
Improve SSHD config to use more secure settings

#### Link to config_db schema for YANG module changes
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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
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#### A picture of a cute animal (not mandatory but encouraged)

Author: liuh-80

build_debian.sh

@@ -467,10 +467,16 @@ 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 900
+set /files/etc/ssh/sshd_config/ClientAliveInterval 300
 set /files/etc/ssh/sshd_config/ClientAliveCountMax 1
 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 15 minutes"
+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
+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