enhancement: allow for connecting to multiple servers at once

[halr9000]

This change may need to happen in multiple areas. For example, everywhere there is a Computername parameter, it should accept an array of strings. The Connect-Splunk function in particular should make it easy to connect to multiple servers simultaneously, and it should output a connection object (when Passthru is specified) which reflects each server connection.

[halr9000]

I'd like all of this stuff to just work, with the exception that the first 3 lines shouldn't even be necessary. Just accept a string array so I can connect in one line.

PS C:\Users\hrottenberg> $conn = @()
PS C:\Users\hrottenberg> $conn += Connect-Splunk -ComputerName bd-idx-01.bd.splunk.com -Credential $cred -Passthru
PS C:\Users\hrottenberg> $conn += Connect-Splunk -ComputerName bd-idx-02.bd.splunk.com -Credential $cred -Passthru
PS C:\Users\hrottenberg> $conn

ComputerName            UserName Port Protocol Timeout AuthToken
------------            -------- ---- -------- ------- ---------
bd-idx-01.bd.splunk.com admin    8089 https    10000   8cb17263db3abcf9cce7f136f04068bb
bd-idx-02.bd.splunk.com admin    8089 https    10000   01380dffa3734de86296452c85f66500

PS C:\Users\hrottenberg> Get-SplunkIndex -ComputerName $conn
Get-SplunkIndex : Cannot process argument transformation on parameter 'ComputerName'. Cannot convert value to type
System.String.
At line:1 char:31
+ Get-SplunkIndex -ComputerName $conn
+                               ~~~~~
    + CategoryInfo          : InvalidData: (:) [Get-SplunkIndex], ParameterBindingArgumentTransformationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Get-SplunkIndex

PS C:\Users\hrottenberg> Get-SplunkIndex -ComputerName 'bd-idx-01.bd.splunk.com', 'bd-idx-02.bd.splunk.com'
Get-SplunkIndex : Cannot process argument transformation on parameter 'ComputerName'. Cannot convert value to type
System.String.
At line:1 char:31
+ Get-SplunkIndex -ComputerName 'bd-idx-01.bd.splunk.com', 'bd-idx-02.bd.splunk.co ...
+                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Get-SplunkIndex], ParameterBindingArgumentTransformationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Get-SplunkIndex

[toenuff]

I would like to see a little more to this. Not only should you be able to specify multiple servers to connect to and run commands against, but out-splunk and write-splunkmessage should be able to write in parallel as well as some round-robin fashion. This way data is striped evenly across indexers.

Additionally, with the round-robin ability, it would make a lot of sense to populate this array of connections by connecting to a search head and having it enumerate all search peers.