Refactor multiple pi resources with context awareness

[yussufsh]

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Relates OR Closes #0000

Output from acceptance testing:

# data sources:
=== RUN   TestAccIBMPICatalogImagesDataSourceBasic
--- PASS: TestAccIBMPICatalogImagesDataSourceBasic (23.28s)
=== RUN   TestAccIBMPICatalogImagesDataSourceSAP
--- PASS: TestAccIBMPICatalogImagesDataSourceSAP (17.62s)
=== RUN   TestAccIBMPICatalogImagesDataSourceVTL
--- PASS: TestAccIBMPICatalogImagesDataSourceVTL (19.71s)
=== RUN   TestAccIBMPICatalogImagesDataSourceSAPAndVTL
--- PASS: TestAccIBMPICatalogImagesDataSourceSAPAndVTL (16.64s)
=== RUN   TestAccIBMPICloudConnectionDataSource_basic
--- PASS: TestAccIBMPICloudConnectionDataSource_basic (33.24s)
=== RUN   TestAccIBMPICloudConnectionsDataSourceBasic
--- PASS: TestAccIBMPICloudConnectionsDataSourceBasic (29.52s)
=== RUN   TestAccIBMPICloudInstanceDataSource_basic
--- PASS: TestAccIBMPICloudInstanceDataSource_basic (23.28s)
=== RUN   TestAccIBMPIDhcpDataSourceBasic
--- PASS: TestAccIBMPIDhcpDataSourceBasic (40.53s)
=== RUN   TestAccIBMPIDhcpServersDataSourceBasic
--- PASS: TestAccIBMPIDhcpServersDataSourceBasic (27.49s)
=== RUN   TestAccIBMPIImageDataSource_basic
--- PASS: TestAccIBMPIImageDataSource_basic (36.09s)
=== RUN   TestAccIBMPIImagesDataSource_basic
--- PASS: TestAccIBMPIImagesDataSource_basic (25.28s)
=== RUN   TestAccIBMPIInstanceIPDataSource_basic
--- PASS: TestAccIBMPIInstanceIPDataSource_basic (75.68s)
=== RUN   TestAccIBMPIInstanceDataSource_basic
--- PASS: TestAccIBMPIInstanceDataSource_basic (35.09s)
=== RUN   TestAccIBMPIVolumesDataSource_basic
--- PASS: TestAccIBMPIVolumesDataSource_basic (60.85s)
=== RUN   TestAccIBMPIKeyDataSource_basic
--- PASS: TestAccIBMPIKeyDataSource_basic (25.84s)
=== RUN   TestAccIBMPIKeysDataSourceBasic
--- PASS: TestAccIBMPIKeysDataSourceBasic (46.61s)
=== RUN   TestAccIBMPINetworkDataSource_basic
--- PASS: TestAccIBMPINetworkDataSource_basic (36.42s)
=== RUN   TestAccIBMPIPublicNetworkDataSource_basic
--- PASS: TestAccIBMPIPublicNetworkDataSource_basic (21.19s)
=== RUN   TestAccIBMPISAPProfileDataSourceBasic
--- PASS: TestAccIBMPISAPProfileDataSourceBasic (24.17s)
=== RUN   TestAccIBMPISAPProfilesDataSourceBasic
--- PASS: TestAccIBMPISAPProfilesDataSourceBasic (35.75s)
=== RUN   TestAccIBMPISnapshotDataSource_basic
=== RUN   TestAccIBMPITenantDataSource_basic
--- PASS: TestAccIBMPITenantDataSource_basic (44.59s)
=== RUN   TestAccIBMPIVolumeDataSource_basic
--- PASS: TestAccIBMPIVolumeDataSource_basic (39.81s)
=== RUN   TestAccIBMPIInstanceConsoleLanguages
--- PASS: TestAccIBMPIInstanceConsoleLanguages (70.88s)
PASS

#resources:
=== RUN   TestAccIBMPIDhcpbasic
--- PASS: TestAccIBMPIDhcpbasic (514.43s)
=== RUN   TestAccIBMPIImagebasic
--- PASS: TestAccIBMPIImagebasic (157.59s)
=== RUN   TestAccIBMPIImageCOSPublicImport
--- PASS: TestAccIBMPIImageCOSPublicImport (1090.90s)
=== RUN   TestAccIBMPIInstanceBasic
--- PASS: TestAccIBMPIInstanceBasic (1003.88s)
=== RUN   TestAccIBMPINetworkPortbasic
--- PASS: TestAccIBMPINetworkPortbasic (70.95s)
=== RUN   TestAccIBMPINetworkbasic
--- PASS: TestAccIBMPINetworkbasic (57.91s)
=== RUN   TestAccIBMPIInstanceSnapshotbasic
--- PASS: TestAccIBMPIInstanceSnapshotbasic (727.89s)
=== RUN   TestAccIBMPIKey_basic
--- PASS: TestAccIBMPIKey_basic (30.60s)
=== RUN   TestAccIBMPIVolumebasic
--- PASS: TestAccIBMPIVolumebasic (105.32s)
=== RUN   TestAccIBMPIVolumePool
--- PASS: TestAccIBMPIVolumePool (74.14s)
=== RUN   TestAccIBMPIIPSecPolicyBasic
--- PASS: TestAccIBMPIIPSecPolicyBasic (67.97s)
=== RUN   TestAccIBMPIKey_basic
--- PASS: TestAccIBMPIKey_basic (33.98s)
=== RUN   TestAccIBMPIVPNConnectionBasic
--- PASS: TestAccIBMPIVPNConnectionBasic (600.58s)
=== RUN   TestAccIBMPIInstanceConsoleLanguage
--- PASS: TestAccIBMPIInstanceConsoleLanguage (84.24s)
PASS
...

[yussufsh]

Sorry for a huge change set but I am revamping the whole power client project.
@hkantare Kindly help with the review.

[hkantare]

@yussufsh Can we seperate new set of reosurces/datasource from this PR

Can fix the conflicts

[yussufsh]

@yussufsh Can we seperate new set of reosurces/datasource from this PR

Can fix the conflicts

I have removed the top two commits and will create individual PRs for them once this is merged. @hkantare PTAL again.