sshd_config.sls

# Client Alive Interval
clientaliveinterval:
  file.line:
    - name: /etc/ssh/sshd_config
    - content: 'ClientAliveInterval 900'
    - match: '^#ClientAliveInterval'
    - mode: ensure

# Client Alive Count Max
clientalivecountmax:
  file.line:
    - name: /etc/ssh/sshd_config
    - content: 'ClientAliveCountMax 0'
    - match: '^#ClientAliveCountMax'
    - mode: ensure




----------
          ID: clientaliveinterval
    Function: file.line
        Name: /etc/ssh/sshd_config
      Result: False
     Comment: An exception occurred in this state: Traceback (most recent call last):
                File "/usr/lib/python2.7/site-packages/salt/state.py", line 1733, in call
                  **cdata['kwargs'])
                File "/usr/lib/python2.7/site-packages/salt/loader.py", line 1652, in wrapper
                  return f(*args, **kwargs)
                File "/usr/lib/python2.7/site-packages/salt/states/file.py", line 2724, in line
                  backup=backup, quiet=quiet, indent=indent)
                File "/usr/lib/python2.7/site-packages/salt/modules/file.py", line 1627, in line
                  raise CommandExecutionError("Wrong conditions? "
              CommandExecutionError: Wrong conditions? Unable to ensure line without knowing where to put it before and/or after.
     Started: 19:02:47.358671
    Duration: 9.581 ms
     Changes:   
----------
          ID: clientalivecountmax
    Function: file.line
        Name: /etc/ssh/sshd_config
      Result: False
     Comment: An exception occurred in this state: Traceback (most recent call last):
                File "/usr/lib/python2.7/site-packages/salt/state.py", line 1733, in call
                  **cdata['kwargs'])
                File "/usr/lib/python2.7/site-packages/salt/loader.py", line 1652, in wrapper
                  return f(*args, **kwargs)
                File "/usr/lib/python2.7/site-packages/salt/states/file.py", line 2724, in line
                  backup=backup, quiet=quiet, indent=indent)
                File "/usr/lib/python2.7/site-packages/salt/modules/file.py", line 1627, in line
                  raise CommandExecutionError("Wrong conditions? "
              CommandExecutionError: Wrong conditions? Unable to ensure line without knowing where to put it before and/or after.
     Started: 19:02:47.368427
    Duration: 0.817 ms
     Changes:   

It's saying that if you use ensure, you need to specify a location to insert the line if it doesn't exist.

Try adding:

- location: end

To your states file. If the line doesn't already exist, it will append the line to the end of the file.