First draft of pinning versions.

Author: marc0der

src/test/resources/features/pinned_version_series.feature

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+Feature: Pinned version series
+
+	Background:
+		Given the internet is reachable
+		And an initialised environment
+		
+	Scenario: A major series is pinned for the default vendor to continuously upgrade
+		Given a machine with "Linux" installed
+		And the system is bootstrapped
+		And the default vendor is "AdoptOpenJDK" with label "adpt"
+		And the following candidate versions are available for download
+		| java      | 11.0.6   | 11     | AdoptOpenJDK | Linux    |
+		| java      | 11.0.5   | 11     | AdoptOpenJDK | Linux    |
+		| java      | 8.0.121  | 8      | AdoptOpenJDK | Linux    |
+		| java      | 8.0.111  | 8      | AdoptOpenJDK | Linux    |
+		| java      | 8.0.101  | 8      | AdoptOpenJDK | Linux    |
+		When I enter "sdk pin java 8"
+		And I enter "sdk install java"
+		Then the candidate "java" version "8.0.121" is installed
+		Given the following candidate versions are available for download
+		| java      | 8.0.131  | 8      | default | Linux    |
+		And I enter "sdk install java"
+		Then the candidate "java" version "8.0.131" is installed
+		
+	Scenario: A major version is pinned for a specific vendor to continuously upgrade
+		Given a machine with "Linux" installed
+		And the system is bootstrapped
+		And the default vendor is "AdoptOpenJDK" with label "adpt"
+		And an additional vendor is "Amazon" with label "amzn"
+		And the following candidate versions are available for download
+			| java      | 11.0.5   | 11     | AdoptOpenJDK | Linux    |
+			| java      | 11.0.5   | 11     | Amazon       | Linux    |
+			| java      | 8.0.121  | 8      | Amazon       | Linux    |
+			| java      | 8.0.111  | 8      | AdoptOpenJDK | Linux    |
+			| java      | 8.0.111  | 8      | Amazon       | Linux    |
+			| java      | 8.0.101  | 8      | AdoptOpenJDK | Linux    |
+			| java      | 8.0.101  | 8      | Amazon       | Linux    |
+		When I enter "sdk pin java 8 adpt"
+		And I enter "sdk install java"
+		Then the candidate "java" version "8.0.111" is installed
+		Given the following candidate versions are available for download
+			| java      | 8.0.121  | 8      | AdoptOpenJDK | Linux    |
+		And I enter "sdk install java"
+		Then the candidate "java" version "8.0.121" is installed