Use consistent naming for allocating SPI.

Throughout the IPsec code (API, system server, netd) we use "reserve"
SPI and "allocate" SPI interchangeably. This renames to use "allocate"
everywhere for self-consistency and consistency with the kernel
(ALLOCSPI).

In javadoc, I am leaving the word "reserve" in several places because it
is still an accurate description of how the method behaves.

Bug: 69128142
Test: TreeHugger should be enough
Change-Id: I8ea603b4612303b0393beef04032671fa53d2106
diff --git a/tests/net/java/com/android/server/IpSecServiceParameterizedTest.java b/tests/net/java/com/android/server/IpSecServiceParameterizedTest.java
index 5c031eb..3d57fff 100644
--- a/tests/net/java/com/android/server/IpSecServiceParameterizedTest.java
+++ b/tests/net/java/com/android/server/IpSecServiceParameterizedTest.java
@@ -125,7 +125,7 @@
                 .thenReturn(TEST_SPI_OUT);
 
         IpSecSpiResponse spiResp =
-                mIpSecService.reserveSecurityParameterIndex(
+                mIpSecService.allocateSecurityParameterIndex(
                         IpSecTransform.DIRECTION_OUT, mRemoteAddr, TEST_SPI_OUT, new Binder());
         assertEquals(IpSecManager.Status.OK, spiResp.status);
         assertEquals(TEST_SPI_OUT, spiResp.spi);
@@ -142,7 +142,7 @@
                 .thenReturn(TEST_SPI_OUT);
 
         IpSecSpiResponse spiResp =
-                mIpSecService.reserveSecurityParameterIndex(
+                mIpSecService.allocateSecurityParameterIndex(
                         IpSecTransform.DIRECTION_OUT, mRemoteAddr, TEST_SPI_OUT, new Binder());
 
         mIpSecService.releaseSecurityParameterIndex(spiResp.resourceId);
@@ -162,7 +162,7 @@
                 .thenReturn(returnSpi);
 
         IpSecSpiResponse spi =
-                mIpSecService.reserveSecurityParameterIndex(
+                mIpSecService.allocateSecurityParameterIndex(
                         direction,
                         NetworkUtils.numericToInetAddress(remoteAddress).getHostAddress(),
                         IpSecManager.INVALID_SECURITY_PARAMETER_INDEX,